Simple, use the same Lionel engines or install ERR boards. Have WIDE radius curves. Use Command Control.
https://www.youtube.com/watch?...amp;feature=youtu.be
Actually, I've wondered the same thing. How are real engines equipped to run together with so much distance apart, weight and terrain changes.
I've been able to my trains to do this, but ..... MY trains are toys.
Looking forward to seeing the answer.