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Interlocked Lever Frame – Part 1; Experiments

One of the features I propose to include on my next layout Glenmutchin is an interlocked lever frame.   This is because one the most common “issues” now on Portchullin is driver error running signals or attempting to go over a turnout that is against it.  Glenmutchin will be a much more complicated trackplan and there will be a fair number of signals on it, so we are bound to have more operator issues!   The use of an interlocked frame is intended to be one of the means of controlling these – after all it is how the prototype did it!
Interlocking frames have been built before but they are not written about much – there are some pieces here:
if you want to look them up.  Whilst is it possible to do this electronically (and people have) I decided I wanted to go down the traditional route of locking tappits, so that if the road was not set correctly, the lever would not work and you knew you had a problem.
Given that Glenmutchkin looks to be heading for a 45 lever frame, with a lot of interlocking I thought it would be a good idea to start on something simpler.  Thus, I have concocted myself a simple layout with a moderate amount of locking; this is what I have gone for:

Test Layout Signalling Plan

And this is the locking chart that I think is right:

If people out there think there are errors in this; especially the locking chart (locking logic is a bit mind twisting) then please pipe up as I will be building it soon!

Glenmutchkin Part 5: Signalling

Whilst they are not without their frustrations (they are delicate for example), I was slightly surprised to have enjoyed building and using the signals as much as I did.   Therefore, Glenmutchkins will going a bit more large on signals.

I am assisted in that the Highland seemed to follow the trend of the pre-group companies and be fairly lavish with their signals.  Taking significant cues from my sources of inspiration, Wick and Kyle of Lochalsh, this is where I have got to with a signalling plan.

Glenmutchins-MTs-version-of

As can be seen, there is a fair amount to this as I have assumed that there is a junction off scene that is signalled from the station cabin (although this is still under review) and not only is the yard signalled onto the running line but both the run around loops and the shed are both signalled.   It looks like this will be a 45 lever frame, so there is a fair amount to do……………

A particular signal to note is the one with arms 17,18 & 19 on it.  This is a repeater for arms 15 & 16 so directs locos coming off the yard where they are to go to.  This exact same situation existed at Kyle and in addition to being a surprising duplication between the two signals the former is that the signal is situated well up on the bank and faces fairly firmly towards the shed, not the running lines.  I do not presently have a photograph that is free of copyright to illustrate this but there are lots in the various text books; try The Highland in LMS Days or LMS Engine Sheds.

Glenmutchkin Part 4 – Inspiration

Glenmutchkin’s main source of inspiration is Wick or its slightly more slimline cousin, Thurso.  These are very similar in layout except for their MPD’s; where Wick’s was quite a lot larger.

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An overall view of Thurso in the 1970’s, with thank to Richard Oaks

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Wick in 1983; photograph by Peter Whatley with Creatives Commons Licence

However, rather than a facsimile of either (hey Ben Alder/Richard Oaks has nabbed that idea anyway!), I am proposing to use the same arrangement of MPD as at Kyle of Lochalsh’s shed area, with the access road leading to a turntable and then the shed roads coming back off this.  Due to the way that the layout will sit in its home, I have had to do a mirror of the shed at Kyle but otherwise it will be the same.

1908 from Time Capsules

A rather fab photo of Kyle shed with a superheater goods (which were the mainstay of the line from about 1930 through to just after the war) on shed.  It is also a fine view of the signal here – one that I wish to model.  Photo with thanks to Jim Payne and available at www.throughtheireyes2.co.uk

All of the lines to the west coast of Scotland; both built by the Highland or any of its rival companies or projected come late in the 19th century – partly as a result of Prof Aytoun’s story that I have paraphrased in part 2.  Wick and Thurso however were built rather before this and are stylistically rather different as a result.  The main differences are the way that the platforms were arranged and the use of a stone built station building/train shed.  However, having decided that the Glenmutchkin was much earlier than this, I felt that I could assume that the terminus was built before any of the other lines to the west coast were achieved and thus use the older style of station.  In practise I have done so because I wish to model the overall roof – probably the building at Wick as its screen to the end of the train shed is very attractive.

Wick_station_1983_-_geograph_org_uk_-_818357 from geolocations

Photo of the road side of the main station building at Wick (that at Thurso is a bit smaller).  Copyright held by Peter Whatley and reproduced under a Creative Commons Licence.

Another feature of Kyle that I will take is the overbridge splitting the station from the shed area.  Being the son of a bridge engineer, I guess I need to get some proper civils into the model and the latticework is quite attractive. I will go for a single span bridge, rather than the twin span seen here at Kyle.

2194733_8d181140 from Geograph creative commons

Copyright held by Ben Brookshank and reproduced under a Creative Commons Licence

Those cattle pens will appear at some point too!

Glenmutchkin: Part 3 – Era

Whilst I seem to be known in the electronic ether for my 1970’s modelling, this is not really my main interest.

Many years ago, I set my main era as the early years of the LMS.  Whilst I do quite like some of the LMS standard classes, it was really the sight of the Edwardian and Victorian locomotives of the Highland in the lined red pulling a rake of fully lined coaches that seduced me.  After all; who could resist something like this:

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or this:

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Its peculiar; I would think that the 1920’s is the least modelled era after about the 1880s?  Think about it, when did you last see a model from this era?

My regret for this period though is the loss of the red oxide painted goods stock.  The Highland often (apparently at random as to when they would and when not) pick out the ironwork of these in black and again I am drawn to the fusion of colour that occurred as a result.  To get over this contradiction; I model in about 1925/1926.  Much of the passenger stock and locos had by then been repainted in the new corporate LMS colours but at least some of the good stock remained in the old pregroup livery.

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with thanks to Ray Nolton for two of the pictures

First Signal for Glenmutchkin

I have managed to finished (for now anyway, see below) the first bracket signal for the layout.  So here are some pictures:

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One error I did manage to include in the build was to make the holes in the balance levers, the crank elbows and the signal arms a tad to big for the operating wire I used.  I used 12 gauge guitar wire and the slop that this creates in a 0.5mm hole is rather too much.  0.5mm drills were the smallest I had when I built this so I have invested in a stack of 0.4mm and 0.3mm from drillsuk (on ebay).  Next time I will try these really small drills because the thin operating wire does look the part.

The effect of this is to allow the arms to slop too much and they will not be capable of being made to bounce properly.  This signal will be in a cutting of the proposed layout, so I will have to replace the wire with something a bit thicker to overcome this.

You live and learn!

I am also having a bit of trouble with the MERG servo drivers; I may be cooking them with my power supply so this needs a bit of work too

Glenmutchkin: Part 2 – What’s in a name?

Glenmutchkin may well be a new name to you but it is one of the forgotten names of railway history; railway proprietors and the public alike from the late 1840’s will certainly have known of it.

We need to take ourselves back to the mid 1840’s first; at the heart of the railway mania frenzy.  Parliament was awash with schemes to build railways in every worthwhile corner of the country and a fair few worthless corners too – so much so that parliament had to sit through the summer recess to consider them (could you imagine that in the 21st century?).  Already some farsighted commentators were predicting that a stock market bubble was forming and this provoked The Edinburgh Magazine to publish an article lampooning the mania – How we got up the Glenmutchkin Railway and how we got out of it; written by Professor W E Aytoun.

Sma Glen

The story concerns Messers Augustus Dunshunner and Robert McCorkindale, two Glasgow rogues who conceived their scheme over a small barrel of whisky.  They concocted a plan to relieve would be investors of their money by creating a railway scheme.  First they found an area of the Highlands that other railway promoters had not yet spotted (that was simple, they just made one up) and proceeded to populate it with an improbable amount of commerce and agriculture.   The human population was noted as being particularly dense, with the centre at the Clachan of Inverstarve. They concluded that 4 million cattle annually needed exported down the line, the hills were covered with sheep & goats but most importantly, the glen included the most of the famous distilleries in the country. Clearly a railway company to such an important part would attract the crème of Scottish aristocracy to its board and here our promotors surpassed themselves; the preliminary board included Tavish Mctavish of Invertavish, The Laird Mhic-Mhac-Vich, The Captain of McAlcohol and The Factor of Glentumblers amongst others.  The engineer, a Walter Solder’s, initial report concluded that the fourteen mile line would be simple to build with four short tunnels being the only engineering features of note.  Given that Mr Solder’s previous engineering experience lay in being a gas fitter, he can perhaps be forgiven in concluding that a total of 6 miles of tunnel through Scottish mountains would be “simple to build”.

Rannoch Moor

“Simple to build” – Glemutchkin today – photo via creative commons from Roger Maclachlan; although he might remember it as Rannoch Moor!

When Dunshunner and McCorkindale published their prospectus, they were not unduly surprised to find four other prospectuses in the same paper for schemes at least as outrageous as their own.  Nor were they surprised to find that initial share issue to be several times oversubscribed; so they nobly sacrificed most of their holdings for hard cash.  Armed with the initial subscriptions, our duo along with their company of advisors, friends and general hangers on headed to London to present their bill and oppose any that might seek to share the riches of Glenmutchkins.  They fought “for three weeks the most desperate battle and might in the end have been victorious had not our last antagonist at the very close of his case pointed out no less than 73 fatal flaws in the plans presented by Solder”.  Of course the opposition could have routed the Glenmutchkin line at the start, but they were just as anxious as anybody to enjoy the fleshpots of London at their shareholders expense.  So all that was left for the promoters was to wind up the Glenmutchkins company and return the few pennies left of the initial subscriptions to the shareholders.

The article attracted wide attention at the time and planted the seeds for scepticism of the railway mania.  Whilst the bubble will have burst anyway; the Glenmutchkin article certain pushed the crash along the way.  This of course cost many people their fortunes but it also particularly hurt the highlands of Scotland.  The article had been based on a scheme to open up a portion of the Highlands and even 20 years later, the promoters of railways in the Highlands found that the ghosts of Dunshunner and McCorkindale had not left the public’s consciousness.

Many of our layouts are based on “might have been schemes” – so I feel I am carry on the tradition, but with a slight twist to my “might have been”.  And hey; there is all that cattle to be transported……………..

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