Most people freelance the scenic setting, but how many freelance the locomotives and rolling stock so that they are not based on a prototype. I am told this is far more popular in the USA because for years you had many different small to large private operating companies while here in the UK one has to go beck to before 1923 or after around 1995 to get this type of thing unless one models narrow gauge to make it plausable, so in the UK modellers mind, freelance tends to be unusual unless one is making a model of an overseas railway system.
I model in narrow gauge, and if one looks at the history of narrow gauge prototypes, one quickly realizes that every railway did their own thing unlike standard gauge, where they had stricter rules and had to make all their stock fit within the sizes and weights allowed etc. (There were exceptios but the exceptions were so well known that it is more difficult to create an illusion of something different. One can invent a whole narrow gauge railway system including locos and stock, and as long as it is based on a rough real area so one can have heard a town name etc, only those who live there or have been there will realize one has made the railway up from ones imagination... Unless one is modelling a scene which is based in the days before the locals parents and grandparents were born in which one can get away with almost anything! It is surprizing how many locals may know of some of the history of the standard gauge lines, but with little industrial narrow gauge lines or tramways, even the locals can be surprized to find out what existed in their area).
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