02-08-2015, 03:26 PM
I've learned the hard way. Having a helix that has an inside radius of 26 inches, and an outside radius of 28 inches, will not allow 2 90 foot auto racks to clear. Even by making the inside loop 24 inches, with the space that I have available, still won't work. Looks like there will be at least 1 Timetable Special Instruction dimensional clearance rule in the rule book. 
hock:
hock: