Sketching-in a mountain branch line, max grade 2%, WHITE, apex height is 24" above the main base layout. O54.
Entrance to the room is an interesting challenge. A number of places and ways to do it. Perhaps three lift-out bridges span a doorway, a double-track bridge for the 0" BROWN line, and then bridges for the LIGHT BLUE at 12", and WHITE at 24" lines.
