If you are new to the CM (Content Manger) make sure you click on the header and add all columns. The more info the better. Then you can search for Category "Locomotives" - You can sort by version number (version of software created with) or upload date or any other. You can make and save these "filters." CM is very powerful in that it can do searches not very apparent, especially when using the boolean operators (and, or, etc). You can also run a filter, open those in a new window, then run another filter on that subset. Takes a while to appreciate the info you glean and the things you can do.
Also, many of the free routes have sessions that will include loco's. You will learn which author/creator knows his/her stuff and look for other routes/sessions by that person. So you might look for CSX routes if that is your interest.