People who are very seriously into trains contribute content to the Open Source TrainSim OpenBVE. You could, for example, drive the tube train on the bottom right through a historically correct tube network.
I just got back to the states, we also went to that museum but didn’t get the amount of time I’d have liked for the visit. It was family vacation; I was negotiating with like seven other people for what we saw and for how long. Next year, I’ll be back in the UK for about a week (sadly, it’ll be mostly just London) and have already carved out plans for a day trip out to York just for the Railway Museum.