I hope this isn't a bit too early. I just stumbled across some interesting photos of a German military railway under the title "Feldbahn-Uebung, Uelzen-Celle, 1892". This is how the photo collection is described:
"This portfolio, held by Southern Methodist University's DeGolyer Library, consists of 32 plates documenting the railroad and military operations along the route from the German towns of Uelzen to Celle. This was a Feldbahn narrow gauge military railway (built by specialists) from Uelzen to Celle via Hermannsburg, built to conduct maneuvers (Uebung) and involving troops from various parts of Germany, notably Prussia, Saxonia and Bavaria. The plates show railroad depots, bridges, locomotives, trains, military encampments, and landscapes."
I don't know anything more so I will let the photos and captions speak for themselves:
Very interesting MarkV. Railways were as essential to landpower as ships were to seapower and all the "great powers" were heavily into documenting each others' fixed/permanent railways in the pre-war years - maps, timetables, locomotive and rolling-stock identification and counting/estimation, the whole "train-counting" thing and a little bit risky for the agents involved. The ability to rapidly build tracks and deploy men and materiel along them was a critical part of any substantial conflict and this would have been a significant exercise to develop, refine and prove the capabilities and methods which came to be used in "the big one" half a generation later.
Despite the rise of airpower as an interdiction method, rail remained a critical part of force projection right up to WW2 and beyond (think "The Bridges at Toko-ri" - Korea). These 1892 exercises were part of the whole story and one I was not at all aware of before you brought them to life. Thanks.
I've had this stashed away for some time - a very full history of the military use of railways, up to and including WWI, from The Oxford Companion to Military History. (I have my doubts about the Liverpool-Manchester railway transporting "a regiment"; I think there were a few troops on the inaugural run, but not a regiment) Other than that, I think some very interesting aspects emerge. One example is the use of different gauges by Germany and Russia in order to make life difficult for an invader.
"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.
Neat summary in that link James. All sorts of forgotten tales of intrigue, bravery and unknown heroes, ingenuity and Herculean effort underlie the story of military railways (and civilian railways in wartime) but none of our "favourite" wars would have even remotely resembled what they were, without that rapid transit and heavy lifting capacity that could (ideally, at least) move an army and all its various arms and supplies across the breadth of a continent in a matter of days.