Okay guys, I gonna save 1,000 words here and use a picture. The back-to-back WYE's are at the yard throat, inside the red circle. To the left is the 20-track yard. To the right are the leads into the main lines.
No that you can see it, I will repeat the question. Can I run large locomotives(Big Boys, Cab Forwards, Challengers etc.) through back-to-back wye's w/o problems?