Turntable at Beattock

What's a suitable turntable to use? The obvious choice is the Peco NB55 model, and according to the catalogue is "based on a Ransome and Rapier 73ft well type turntable, supplied to many railways both at home and overseas." In other words, it's generic.

The turntable deck is 151mm (6.1 inches) diameter. It's just too big to fit comfortably on the layout, according to XtrkCad. The turntable at Beattock was "a balanced 54ft unit from Cowans Sheldon nearby at Carlisle" (source: LMS Engine Sheds, Vol 5). So it was 19ft (36mm in N gauge) smaller than the Peco effort. It was probably only used to turn banking engines - a Duchess or similar would never have fitted on it.

Re pictures, there aren't any. The only source I have is my North from Carlisle video (B&R videos, vol 33) which has a scene where they turn CR439 class 55234 prior to towing it off to be scrapped. You can see that it's a well-type table, but barely long enough to squeeze the tank onto.

My plan, such as it is, is to buy a secondhand Peco version on eBay and cut it down. I suspect I'll need a few goes at this, hence using the cheap option.

***Update: the video source is Cinerail's North From Carlisle, not B&R.

Beattock track plan

I've found no definitive plan of Beattock station as it was for most of its operational lifetime. The key sources are Alan Kirk's article on Beattock Station Modellers' Backtrack Jun-Jul 1993, Branches & Byways: Southwest Scotland and the Border Counties by Robotham, and LMS Engine Sheds Vol 5 by Hawkins & Reeve. All of these place the turntable close to the engine shed, but Hawkins & Reeve state that the turntable was moved to "the southern end of the down platform" in 1899.

A visit to the British Library showed that the turntable was indeed near the engine shed in the 1870s, according to a six-inches-to-the-mile map (which I forgot to record and will have to revisit to record the source and date).

I assume, therefore, that the three sources all use this old map as the original.

I have, however, a video of Beattock station in the 1950s & 60s (Great Steam Routes: The West Coast Main Line), which shows (fleetingly) the position of the turntable. Another video (North from Carlisle) has better footage of the turntable itself but the location is less discernable. 

So it's possible to guesstimate where the turntable was.

I've used XtrkCAD to plot the track plan, allowing for some simplification and compression (otherwise it's just too big and unwieldy) - operationally it should be fine.

The overall track plan (omitting some sidings and structures) looks like this:

 

The baseboard will be made up of four 4 x2 boards, with two 2x2 boards at either end as turning circles. I had hoped to squeeze it all on to four boards, but the boards then become too wide, or too short to create the visual effect I'm after.

It's basically a glorified dumbell layout - allowing long trains to run through uninterupted if desired, but goods shunting, banking and a branch line to maintain interest.

The station throat, goods yard and engine shed complex in detail looks like this:

There are plenty of points to install, and I'll need to check whether these coincide with baseboard joins or bracing.