If you're going to do this, pick a specific era and location, and determine what locomotives and cargo types you want to include in the project. So far you guys seem really indecisive about what you want to do. I'm relatively well versed in railroad stuff, so hit me up if you want any suggestions. If you for sure choose to base this project on American trains, here are some suggestions. Based on the current engines you have in the poll, you should do eras like:
1970s-1980s (GP-35, GP-9, F45, F40PH, SD40-2, F Units, Dash 7, Dash 8, etc.)
or
1990s-2000s (Dash 9, ES44, AC4400, AC6000, SD40-2, SD70, SD90, P42, F59, etc.)Obviously it would take way too much work to make all these vehicles, but pick an era and stick with it.
*cough* arekan *cough*
also this for good quality sounds ^^