Hello, I am the train autismo. 

Derail Valley is currently the only train simulator built for VR which is actually focused entirely around the task of driving a train and completing various jobs using said train. It has serviceable graphics but handling physics are questionable and while the map is a good size it is obvious it was at least partially generated. Early releases had entire sections inaccessible due to rocks or trees on the track which simply hadn't been fixed. I believe most of that is fixed now but I would be surprised not to find one or two little hitches that end up derailing you unfairly even now. The general modelling of the locomotives is fair, but not great and could certainly stand to be better. Rolling stock is bad if accuracy is what you're after. Despite that though it isn't a bad game and you can get many hours of enjoyment from it. Buy it on sale if interested. 

Rolling Line is less of a train simulator and more of a train-set simulator. You have complete creative control over your scene, with free editing of track, scenery, rolling stock, engines, even the tables they are on and the rooms those tables are in. It can be a handful to get used to but it is extremely rewarding and you can while away hour after hour carefully constructing your perfect layout. It also has built-in steam workshop support for easy sharing and adding new parts to your collection. You are fully in control of all switches and locomotives on your line, being able to control both from either a "standing beside your layout" perspective or from down on the ground, which can be a lot of fun, you can even hop into the train cabs and directly control them, though it isn't realistic at all. I highly recommend it if the actual physical simulation of trains isn't what you need.