Two questions. Did SW7 mu with other SW7's ?? SW9's did.
Are there MU end hand rails and deck step available for these models?? None pictured.
I can answer the first question and yes, you can run two SW7's together. I am not sure what you are referring to in reference to your second question.
MU (Multiple Unit Handrails on Atlas SW's Allows for a trainman to walk through from one engine to the next.
Altas had end handrails (non MU) similar to the Lionel one's pictured. Step is missing. Hand rails were road specific.