Good to see your modelling and how well it reproduces the equipment used by the British and Dominion railway units in 1916-1918.
However I would not agree with your assertion that in 1918 the railways ran in un-scarred land compared with 1914-17.
The formation of the WDLR came as result of the transport failures in the Somme and elsewhere,
and really only made an impact from late 1916 onwards.
The front had stabilised in 1915 and having visited the Western front on a number of occasions,
I can report that we fought over the same few miles of muddy ground,
until late 1918 and the British breakout following the battle of Amiens.
This left the rail systems behind as trench war broke down.
The attached photo is from March 1918,
and clearly shows a "tin turtle" in a sea of mud somewhere near the front.
I have the two WDLR books by Roy Link and have spent hundreds of hours on the IWM site.
It would be great if the IWM would post more in the future.
I am also hoping to get to the Canadian archives in Ottawa to see what they have hidden.
Corps Of Canadian Railway Troops – Europe 1918
The first two are the Narrow Gauge in The Arras and the Somme sectors.
For me they are interesting as they cover the use of 60cm equipment after the war,
especially in the sugar beet industry and what is in existence today.
Not sure if they are in print, but the Plateway Press “Narrow Gauge at War“ and “Light Track from Arras” are also very good.
I suspect between these and maybe a few others, they cover most of the known photos of these operations.
Although there seem to be some surfacing from the collections of the APPEVA at Cappy-Froissy in Somme France.
There is quite a lot of preserved rolling stock around and I could get some photos if you wanted.