Well, there's Dovetail Games for one with different versions of train sims with nice detailed routes but I think Trainz is easier to work with for creating routes, modifying and merging routes, etc. and in the old MSTS you were stuck with one train during a session, you coudn't switch between locomotives and trains. Turntables were non functional. You could only have a non electrified route or all electrified, not a mixture of both. Trainz is continually advancing with new features. The thing is though is sometimes the competition has a better route than the Trainz version, like there is a complete Harlem line for free on Steam for Train Simulator by Dovetail but you must own three pay DLC routes for it to work properly, it has the route into Grand Central Terminal unlike the Trainz version which does have an extension on the DLS but it was never completed below the Harlem River lift bridges which are missing, the creator probably never put them in. I found a close enough bridge by the late Ben Dorsey on the DLS. There is also a New York City Region route which has the line into Grand Central and the Hudson line up to Garrison, and Penn Station and the tunnel to NJ. I could merge the Harlem, Harlem extension and the NYC routes together and lay track from the Harlem extension to connect with the Hudson line route into Grand Central. There is also an official Harlem Line for Train Sim World, but it only goes as far north as North White Plains. The Trainz route goes as far north as North East which is the end of electrified territory. I could add on to it with blank DEM height adjusted for the diesel only section to Wassaic. I don't like sloppy routes in Trainz though with crooked bent track and scenery just thrown together that look like they were done by a 10 year old. There's a bunch of those on the DLS.