Not necessarily so.
Those detailed engines and rolling stock are usually given a prototypical, if fictitious, location to run in, with correct signalling and lineside features, are they not?
Probably the only exception , apart from train sets, is narrow gauge?
However, it might be an idea worth considering for the 2011 challenge - create a snapshot of a completely imaginary railway which might-have-been.
Must include at least one free designed loco, carriage and truck; which could be modified kits, RTR or scratchbuilt...