It looks to me like they are trying to make another children’s game rather than a serious simulation. I believe that to be an unwise move, since the bulk of the train enthusiasts are older people who want all details to be correct. Children do not complain if something is realistic, but enthusiasts get upset when things are wrong. It would have helped if they consulted with somebody who has a clue about railroads, they might have avoided such blunders as a locomotive without a tender.
A major weakness is that there are no passenger engines available for the 1850-1900 period. The Baldwin six-wheels was a freight engine. Without too much effort they could also have made a model of the fast passenger engine Baldwin built for the Virginia Central in 1849, since most of the parts are the same. Having both freight and passenger cars and engines available with reasonable update intervals is a must for a proper railroad operation.