I have been continuing with the wiring of Glenmutchkin, but have hit a snag; one that I should have been ready for – the wiring of the slip, I had been aware that a diamond crossing was a challenge to wire and I was suckered into thinking that the switches on a slip could over come the challenge, Well I go that wrong…….!!
The basic problem is that there are a choice of two routes through a diamond crossing and each route requires the polarity of the crossings to be different. The diagram below, which shows how a diamond crossing needs to be wired, should illustrate the problem. The only solution to this is to power the crossing polarity by way of an approach turnout – if you really don’t have one to set the polarity with, then you are going to have to resort to some switches – but at least it will give you a good excuse to interlock the diamond crossing with some signals to remind you on which direction it is set!
Hopefully this is clear that the crossings on the diamond crossing are activated by detecting the direction of the switch on the approach turnout. If it is set for straight ahead, then a train can’t travel over the crossing and therefore the parallel line can so the polarity of the crossings are set accordingly. Conversely, when the approach turnout is set to the branch, the line across the diamond can be used and the polarity is set to suit.
The principal with the diamond crossing needs to be heeded when the crossing is replaced with a single slip as I have, but it does get more complicated because the switch of the slip can also lead to a different route through the crossings. The crossing to the left of the slip is the more straight forward as it is only activated by the approach turnout. However the right hand crossing is more complicated as if the approach turnout is set for the branch then it always needs to be in the red polarity whereas if the approach turnout is set for the main, then it then needs to be controlled by the slips switch.
Hopefully the diagram above shows how this works.
The irritation I have, in addition to having wired it up wrong already (!) is that the approach turnout is on a different board to the slip. To reduce the number of wires crossing the boards, I have decided to simply use a duplicate point motor for the approach turnout located on the same board as the slip. It is expensive but rather more simple than the additional wires.
NB – please see also a follow up post on this wiring arrangement for an alternative approach.
One of the most characteristic features of the Highland Railway’s locomotives for many years was the louvered chimney. This was fitted to almost all of David Jones’ locomotives and although some lost them over their lives, most retained them until withdrawal. Indeed this style of chimney can still be seen on the preserved Jones Goods which is presently in the Riverside Museum of Transport in Glasgow.
There is debate as to the reason that these chimneys were fitted but it is generally considered that they sought to assist in the drafting of the fire on the downhill sections of the line. There were many long descents on the line and regulator would be closed for such descents and thus the fire was not drafted by the exhaust from the cylinders. The louvres would have allowed the passing air to pull on the fire to keep .
Clearly for such a characteristic feature of the line, it is important to model it well on my locos but I am not totally happy with the renditions that are available. The whitemetal chimneys look too chunky and neither the cast brass (Lochgorm) or turned brass (Jidenco/Falcon Brass) have very distinct louvres. I feel that they can be improved and this is how I go about doing so; in this case starting with the Lochgorm Models cast brass chimney. Similarly, if you are turning your own chimney, the same situation arises,
I started by some basic improvements to the chimney. I found that my casting was not parallel down the shaft of the chimney, being fatter at the top, and also not particularly smooth. I therefore turned it down a little on a drill with some needle files. The casting sprue was not particularly central so to be able to turn the chimney it was first necessary to file this to get it more central. Thereafter, I drilled out the chimney to 4.5mm diameter to its full depth on a pillar drill. I am doing this partly for appearance but really because I intend to put sound speakers in the smokebox and it is necessary to leave routes for the sound to escape – the most authentic being to chimney! Casting brass is very hard and this is no little task – it takes some time, lubricant and anyone in the house need to be able to tolerate a good amount of noise!
The Lochgorm Models cast chimney has a series of depressions to represent the louvres and these are what I felt needed improving. I started this with a piercing saw with a fine (OOOO) slot at the top of the cast depressions. This is cut across the whole width of the depressions and a little further beyond, ignoring where the pillars between the slots are.
These are then given a chamfer slope with a needle file that has a blank face (to make sure it does not cut above the slot). This also needs to be taken beyond either end of the intended louvres to avoid the impact of any taper. The top three have been formed in the picture below, with the lowest still just the piercing saw cut.
Once all have been formed, the next task is to undo all of the work by filling them in again! All of the gaps are flooded with solder. I used 145 solder as it would survive the reasonable temperatures that would be incurred in soldering it to the boiler but also be soft enough to carve out again.
The louvres were then marked out, starting with the two vertical rows either side of the central pillar that must match the highest point of the flare. Then with a knife, the solder infill between these is cut back out. The knife can cut through the solder to cut it out but does it will not affect the brass, so the louvre is reformed. I found that the technique was to initially cut it away and once a basic amount was removed the blade can be scraped side to side within the louvre to get a smooth surface. This brings up burrs of solder at either side of the louvre which are then cut out. This is what it looks like with the first two columns of louvres done – I found it best to do it like this as it was easier to get them vertical than by doing them in rows.
You will find that you get through a fair few blades doing this as the most challenging part is getting the corners crisp (and the photography is very cruel in this regard!). It is also easy to be a bit enthusiastic and accidentally cut pillar – if this happens, it can be reformed with a dab of solder and the process repeated until there is a neat row of four slots in four columns.
Once you are near to finished, a dusting of grey primer shows up any remaining inconsistencies and hopefully it looks something like this:.
This process creates not only the slope of the louvre opening but also the dark shadow of the cavity. In my view these features are necessary to capture the feel of the distinctive feature of the Highland Railway. It takes around 2-3 hours to make each chimney and in I reckon it is worth the time and effort.
I no longer affix roofs firmly to the body of my coaches as makes both the building and the painting much easier. The downside of this is that there is the challenge of keeping the roof on tight without there being any visible joint between the two as this looks terrible. The solution I now use is to clamp this to the floor with 10BA bolts by way of brackets as can be seen in the photograph below.
As built, these coaches had full length step boards but they lost most of these through their life. They were electric fitted from the outset. The chassis below is close to finished except I have run out of vacuum cylinders so these will need to be added, along with the vacuum pipes.
The bogies are also a key part of the proposed kit and are something that I have been working on with Justin Newitt of Rumney Models – the idea being to combine the sprung bogie design that he has prepared with cosmetic etches for the sides and then the castings from Lochgorm Models or perhaps our own in due course. The bogie is quite sophisticated with both primary and secondary springing – the latter is on the bolster and is as below.
The primary springing is on the axleboxes and has bearing carriers, much like the Bill Bedford sprung W-irons. There are still some wrinkles to iron out so it is not there yet but they do make up into some pretty neat bogies; don’t you think?
The only area of the first test build that truly did not work was the corridor connections and it is going to be a case of back to the drawing board for these but other than the final few bits to be completed, the build is finished and I think the vehicle is handsome.
So, off to the paint shops soon, but there is a bit of a holiday to squeeze in first!
Now, I wonder if that heading will gather a few extra viewings………..?
As I have mentioned before on this blog, every few months I catch up with a group of mates to have a joint modelling session. The general gist of these is a combination of banter, a bit of modelling, more banter, a visit to the pub, even banter, a bit more modelling and all nicely rounded off with some more banter.
Last week saw us on the south coast to do some weathering – or rather some of us. One of our number was preparing for their imminent marriage whereas Oly (one half of OTCM) felt his budding TV stardoom was a sufficient excuse to hang up his airbrush. We do fear that Oly may not return to the fold; preferring instead to do his modelling with Brad, Leonardo and Denzil once he makes his silver screen debut in the autumn – don’t forget your roots Oly……….
We were all concentrating on different things; Peter constructed the better part of a bridge for his Aultbea layout and Chris was weathering some rather neat little shunters. For my part, I concentrated on weathering some of the stock that I have been building lately (and sometimes not so lately!):
First up is a pair of horseboxes. On the right is my HR version based on a Microrail kit – still in need of some glazing. On the left is the Caledonian’s equivalent based on a kit from by Spratt & Winkle. Both are in their pre-group livery as can be seen. As such stock was used in passenger trains, I have sought to give them an aged but largely cleaned feel – with the dirt largely present around ironwork and difficult to clean spots.
Having mucked up the weathering of some brake vans at the previous weathering session, I was also keen to get these corrected. This is where I have got with them.
As can be seen, I do not follow the school of thought that the pre-group or 1920’s era stock was constantly pristine. If you bother to look at contemporary photographs, little is clean and some of it is downright grubby. Railways in the steam era were very dirty places; it is inevitable where so much coal, ash and smoke prevail. Furthermore, I can not see even the most houseproud of railway companies regularly (or probably ever) cleaning their goods stock and most of these show stock that is care worn and soiled. This is the feel I am seeking to capture; not the utterly neglected and on its last legs look of the final days of steam but of railway materials that earn a living the hard way.
The pair of brake vans above are to HR diagram 39 from 1922 and are from a Lochgorm Models kit. There is some doubt whether they were delivered in 1922, as there are no known pictures of any of them in HR livery. However, I applying the “its my trainset rule” a number of modellers have painted them in Highland colours; including Paul Bannerman whose example is below.
The other highland brake van I weathered was the diagram 38 brake van. This originates from a Microrail kit and may well still be available from David Geen occasionally at shows as he does own the rights to the artwork. I have modified this with the early pattern roof look outs. These allowed the guard to look over the train around the twisting curves that characterised parts of the Highland’s system. However, there were complaints about whacked heads as the guards came up and down the steps to look onto the lookouts and as a result they were modified with approach cutouts on the roof – take a look at the Lochgorm’s page above to see an example.
Next up on the weathering front were some wagons and NPCS. The first pictures being the weathering to a couple of the items I have described in the pages here – the Oxford Rail NB jubilee wagon and the Mousa Models LNWR van.
And then some rather more ancient models of mine, a Highland Railway meat van from a Sutherland Castings kit and a GC van from another Mousa Models kit.
Finally, a group of wagons for Benfieldside. The hoppers have been seen before and the brake van we will hear more of another day.
Following the last delivery from the etchers, it was time to get on and do the first test builds. First up was the dia 51 Full Brake. This vehicle was one of the later coaches from the Highland Railway and was of similar design to the cove roof corridor coaches that have been available from Lochgorm Models for some time. They were also amongst some of the last highland coaches to service as tool vans etc. This is what one looked like late on in its career after its corridor connections had been removed.
As with my efforts for the scrap tank, I am seeking to try and be a bit smarter with some of the kit design to draw together ideas of assembly of my own and also those of others. So starting with the ends, these will be made with a double skin to both provide the footsteps and, less commonly, some tabs to allow the sides to be secured to them.
I have always found that too many etched coaches have flimsey sides that become distorted as they are made (or when ham-fisted me does anyway). Therefore, I have designed this such that the head and base of the side have significantly sized stiffening pieces, as can be seen below. These are designed to interlock with the tabs at the ends such that most of the locating of the parts is largely defined by the kits components.
Once the basics of the shell are together, this is what it looks like.
The roof proved to be one of the most challenging parts of the build. I had originally designed this with an inner to form the shape of the roof and then a thinly etched outer layer to go over this to provide the rainstrips and other detail. It proved too difficult to get the two to laminate well or even be rolled to a similar curve.
Instead, therefore, I ditched the outer layer and relied only on the inner. This had been half etched on the underside to assist its rolling to the curved profile. I found that it was still difficult to roll the roof due to the tightness of the curves at the extremity of the roof but by simply using bending bars it was quite easy to put the curves in with a limited amount of faceting. Faceting is where short straight sections with bends to the next short section that gives the impression of a curve. Once this was then filed on the outside to smooth out the facets, a smooth curve became pretty good. Thereafter, it was necessary to form the rainstrips with wire and file them back to square sections and as you can see, the effect is pretty convincing.
The underframe and bogies are to follow, in part 2.
I had a delivery at work which was rather more interesting than the average box of lease documents I usually get…………it looked like this.
There are a number of items in this, some parts for some locos I have underway and an attempt to adjust the ECJS 6 wheeled bogies but the key goodies in this are a MR 6 wheeled full brake (to dia 530) and an HR bogie full brake (to dia 51).
The MR full brake should look like this:
and the Highland’s full brake here
So all I need is some time to do some more testing building…………..
Well, that’s true of the top side, where nothing visible has happened of late but there is progress when you look underneath.
I have spent more than a few hours soldering dropper wires on about half of the track that has so far been laid. All is neatly colour coded (hopefully).
Another development in comparison to Portchullin is the painting of the entirity of the underside of the layout white. This is to make everything clearer and will, hopefully, make it easier to deal with issues with the layout set up – although I am hopeing for less issues!
Even more hours (weekends even!) have been spent making up jumper connections, so hopefully the wiring will speed up in the coming weekends! I have spent this time to work through the logic of the wiring across all boards and there is a full wiring schedule in place – none of the wonky logic on Portchullin this time!
I promised a number of people that I would be making sure that the layour had at least the main elements wired up over christmas, so that it could at last run. But then it was a bit wet and cold so I did not fancy it out in the summerhouse so I applied rule no 1 – its my trainset!
Instead, I stayed at the bench and made a pair of the signals that still remain to be made for Glenmutchkin. The signalling plan has developed very slightly since I originally showed it back here and is shown below (actually this is the artwork for the control panel facia).
The signals that I built were those that control the main loop prior to the shed link – levelrs 27 & 28 – and then the outer starter (that covers both the main loop and the main line) – levers 23, 24, 25 & 26. Only a pair of two doll signals, I thought, they shouldn’t take more than a day or two? Phew, well that wasn’t right; the more you look at the prototypes, the more you find there is to model!
Having created much of my own etchings and castings for MacKenzie & Holland signals I have obviously made good use of these. In this case, the small brackets, arms, ladders and castings.
Both of the signals have used the small brackets to create smallish landings. The smaller of the two signals has only one arm per doll, the larger two. The dolls and the posts are made up of square brass section which is filed to a taper – a certain amount of elbow grease is needed to acheive this! The posts are then sandwiched between some transom beams that also clasp the doll post – this is all soldered with a high melt solder to stop it ungumming later.
The brackets are then offered up from below, with scrap etch forming the bearing plates to pick up the transomes. In the etch I also included smaller brackets to pick up the free end of the landing, along with the landing itself. This gets you to the stage shown above.
But this is not the half of it on a signal, there are the finials, lamp brackets, lamps, cross stays, access steps, access ladders, pivot plates, handrails, operating cams, safety hoops and ladder still to do………..
In a departure from my previous practise, I made the main ladders detachable (they will be held with the wire that can be seen in the pictures being turned over in secret pockets. I am also going to paint this prior to the final assembly; which will mean some touching uo of the painting later but I hope will make it easier.
And of course, I had to sign them with these rather nice custom name plaques from NBR 4mm Developments.
This is the first time that I have used the brackets in signal making and I was pretty chuffed with how they have come out. This is where things presently stand and we head for the paint shops tomorrow…….
I have been back onto the layout of late, with a view to get the first wheel turning on it before too long. That means attacking the electrickery things, beginning with the control panel.
I made a start on this by drawing up a diagrammatic representation in MS Paint and then using this to get one of the online firms (Vistaprint) to print me up a poster board to form the basis of the control panel. I am not sure I chose the right material as it turned up on a light weight foam board and I had to mount a sheet of aluminium behind for it to be stiff enough to be useable. But it did look pretty smart I thought………….
The control panel deals with all of the signals and turnouts that the cabin will have controlled, with local ground frames (which will be located on the boards locally) to be used to control the goods yard and the MPD. The latter will be arranged such that it can be located either to the front or the rear, to allow some flexibility in operation.
I have got to the point where the full extent of switches have been wired in and I am just completing the jumper leads. I took a lot of care to plan the wiring prior to any construction – despite the locos being DCC controlled, there are an awful lot of wires. This is because I have stuck with traditional control for the turnouts and signals. There is further complication as a result of the desire to incorporate some bells and even a block instruments (well maybe, at the moment it is just the wires!). So in all, there are 90 odd wires doing something or another on the layout.
Somewhat in contrast to Portchullin, I have sought to keep the wiring as tidy as possible; everything is neatly collour coded and even labelled (to be fair it was labelled on Portchullin, but in a non colourfast ink………..!). I am hoping that this will make the wiring easier to debug at the start of the matter and repair if it does get damaged.
I am proposing to use a variety of connectors between boards and to the control panel, including this rather nifty varient of the D-sub range that is wired directly onot a cheeseblock wireless connector. Available to a variety of types from ebay including from this seller.
Don’t worry, it is not as dramatic as all that, I have not burnt it or anything……………………oh hang on a minute, I have – well a bit of it anyway!
One of Portchullin’s quaint little foibles was it did occassionally like to derail trains as they left the fiddleyards; especially the fiddle yard representing Kyle. There were various reasons for this; including some proper cr*p woodwork on my part, the hand shunting that occurred every time a train was turned around, the effects on thermal expansion that was not catered for and, something that I had not seen until recently, a bit of a dogleg at the baseboard joint. Add to this the rather Heath Robinson approach to the legs for the fiddle yard boards, electrical connections and facia support and it was fundementally a b*ggers muddle. So something had to be done and, a mere 8 years after the layout’s first exhibition, it now has!
So with lots of thanks to Tim and Julian at the Electric Loft Ladder Company again, we have a new fiddle yard at the Kyle end and redesigned legs at the Inverness end. The design adopted is an adaptation of the sector plate that was in use before but with a refinement that it uses cassettes for the locations that the loco arrives and departs at. The idea being that these are both storage points at the end of the fiddle yard roads but also the means to move/turn the locos ready for their next duty. This is a development of the system used by Simon Bendall on his layout Elcot Road, but with a rotating sector plate rather than a traverser.
Other halfway novel ideas are the use of the tray below the traverser as a storage tray for stock (and maybe tea!) and the projection of the sector plate beyond the end of the fixed board to make the ensemble smaller to transport. The facia also folds up rather niftily as well – photos of this will follow once I have taken them!
The new fiddle yard has not yet been tested but will very shortly get its chance to prove if it is a good’n. Portchullin will be out at the Barnstaple MRC’s show in Bear Street, Barnstaple – you can find details here. If you are in North Devon at the weekend, stop by and say hellow?