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After a bit of time googling and coming up empty I am either not using the best keywords or there are/were no tunnels with three tracks running through them.  I am modeling the 40's-50's.  Were three track tunnels not utilized?  I am betting the expense of widening the tunnel would have made it cost prohibitive.  

I am designing my next layout and a 3 track tunnel would help me hide the switches that run down to the lower level while maintaining my passing siding. 

Thanks for any information or pics.

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T4TT posted:

After a bit of time googling and coming up empty I am either not using the best keywords or there are/were no tunnels with three tracks running through them.  I am modeling the 40's-50's.  Were three track tunnels not utilized?  I am betting the expense of widening the tunnel would have made it cost prohibitive.  

I am designing my next layout and a 3 track tunnel would help me hide the switches that run down to the lower level while maintaining my passing siding. 

Thanks for any information or pics.

Correct, just like rr bridges, most are two track tunnels and a single tunnel next to it.

MELGAR posted:

If your railroad needs three tracks through a tunnel, I don't see any reason why you shouldn't build it that way. You can use two portals for the three tracks. Again, check out Oscawana Tunnel.

MELGAR

I did and IT's Two tunnels, ONe with two tracks and another with one track. I believe at one time Both tunnels had Two tracks in each of them.

T4TT posted:

After a bit of time googling and coming up empty I am either not using the best keywords or there are/were no tunnels with three tracks running through them.  I am modeling the 40's-50's.  Were three track tunnels not utilized?  I am betting the expense of widening the tunnel would have made it cost prohibitive.  

I am designing my next layout and a 3 track tunnel would help me hide the switches that run down to the lower level while maintaining my passing siding. 

Thanks for any information or pics.

If you are going to hide switches in a tunnel, be sure that you can get to them and their switch machines for maintenance.  The hidden ones are the ones that will have problems!  (A well-known Murphy's Law variation.)

I think the Erie tunnel in Bergen, NJ has at least three tracks.

I would make the mountain "top" of the tunnel out of lightweight foam and a removable section, so you can address issues with the switch tracks when they arise.  It seems that pins or pegs in the bottom of the tunnel, along with corresponding holes in the platform surface would make it easy to remove and replace for troubleshooting.  My $.02.

Ted S posted:

I think the Erie tunnel in Bergen, NJ has at least three tracks.

I would make the mountain "top" of the tunnel out of lightweight foam and a removable section, so you can address issues with the switch tracks when they arise.  It seems that pins or pegs in the bottom of the tunnel, along with corresponding holes in the platform surface would make it easy to remove and replace for troubleshooting.  My $.02.

sorry but its just two tracks if you google it...

 

TFTT;   I just emailed to you a photo of a triple tunnel from an unspecified geo location.   

If others would search for "Railways of Germany   English    triple track tunnel" and slide down the page you will see a fantastic prototypical triple tunnel.    Also some nice three track model examples.   I have the photo but can not post it per copyright rules.

Due to the oblong / oval nature of a three track tunnel it would rise well above the typical 6" clearance used by many.

Last edited by Tom Tee

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