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Rob English posted:

Depends on what you plan to run. If you are going to run a 381 then 7" is not enough. 219 crane is  tall too. Flyer 4021 Caboose is close to 7", and so is any loco with the large pantograph

 

I think the portals on the Lionel 140 tunnel were about 7" high. Always bugged me that as big as that mountain is the 219 crane wasn't even close to clearing the portals. Heck if  you didn't position it just right even a 500 series box car was close but that might have more to do with the width. 

A modicum of searching reveals this information copied from here:
The "original" 300 Hellgate Bridge is 28-1/2" long overall, 10-3/4" wide, and 11-1/2" high. The clearances of the bridge opening are 5-7/8" wide and 7-1/2" high at the center point of the arch (7" above tubular track rail).

The re-issue 305 Hellgate bridge is 30" long overall, 12" wide, and 11-1/8" high. The clearances of the opening are 7" wide and 7-1/2" high at the arch center point - still 7" above the track rails.

NB: emphasis added for clarity.

Last edited by Überstationmeister

3C62078E-746F-4E82-B0F8-DAA0E7640D96This photo isn’t the best but hopefully you will get the idea .  This standard gauge tunnel is raised up by the thickness of a 2x4 . I did this because I have or had a 4x12 standard gauge live catenary layout in my shop . I needed the clearance for not only the pantagraph but for the catenary wire .  The back 2x4 thick block was a simple straight block the length of the tunnel .  The front riser was curved and wide enough for the bungalow you see in the photo . Both risers were covered in the same material as the platform, indoor outdoor green carpeting.  It was a simple and cheap way of getting the height I needed , plus having the tunnel raised up like that, l could enjoy seeing it .

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