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Height requirements for n-gauge

Started by drbob01, January 20, 2021, 04:35:09 PM

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drbob01

January 20, 2021, 04:35:09 PM
I would like to create overpasses for tracks crossing other tracks, using a bridge or tunnel.  What is the requirement for clearance?
Thanks!

chaz

#1
January 20, 2021, 05:09:39 PM
I use the NMRA Clearance Standard S-7

Of course, I also cheat.
MP 525.25 on the Prosser Subdivision of the North Kansas Division of the MOPAC Railroad.

Vic A

#2
January 21, 2021, 01:07:09 PM
Yes, the NMRA standards for sure.

Two inches works for double stacks.
Figure 26' for proto clearance x 12 inches = 312.  1/160 of 312 is 1.95 inches.  2" is good.
Simplifies grade calculations - for 2% grade you need 100 inches run for 2" rise.

Vic

MapReader

#3
March 18, 2021, 06:17:34 PM
Quote from: Vic A on January 21, 2021, 01:07:09 PMYes, the NMRA standards for sure.

Two inches works for double stacks.
Figure 26' for proto clearance x 12 inches = 312.  1/160 of 312 is 1.95 inches.  2" is good.
Simplifies grade calculations - for 2% grade you need 100 inches run for 2" rise.

Vic

Except that after deducting the subroad bed, the height of the track, the thickness of any cork or foam, and any overhang of the bridge structure, two inches won't be enough.
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