OK, so RSC stands for Rail Simulator Corporation. Yes, was Rail Works, and now it is Train Simulator. You are looking for the RSDevTools which cryptically do not give you tools, but documentation. It is some of the best they have, and they leave you wanting.
You can find it on their web site:
http://www.railsimulator.com/support.phpIts a simple installer, but its been awhile since I last ran it. I seem to have my file at:
'...\railworks\Assets\DMV\Models\Docs\Manuals' which is a custom location so I think it will as you where you want them. In this folder you will see 52 PDFs, an you want to first read '9.01 Create an Engine.pdf'. This will show you the bare basics of how to make a blueprint (the XML which describes your model to RW).
When I first started creating models for RW I used SU and ported them to 3DC. I have nothing against SU (I think its a great environment) but it was getting to be a hassle to port them over and make all the corrections in 3DC, so I decided to jump feet first into 3DC and learn it. I have not looked back.