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Minimum Dimension for Tunnel


Joined: 1-01-70

Topics: 3

Replies: 1

Posted: Mon 17th May 2010, 6:21pm
Minimum Dimension for Tunnel

I am helping with a design for a new 7.25 g railway, and i am wondering if there are any set minimum dimensions for the tunnel portals. Many Thanks

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Joined: 1-01-70

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Replies: 5

Posted: Wed 23rd Jun 2010, 6:31pm

I cannot just remember the exact diameter we used for our tunnel but something to bear in mind is the track bed. This will take height from the tunnel, also remember to account for any gradients through the tunnel.
On the flip side remember that you and your passengers should be seated which lowers the height required significantly.


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Replies: 199

Posted: Wed 29th Sep 2010, 9:33pm

According to the HSE guidelines 'tunnels should be designed with adequate width and headroom to ensure safety in cases where it is necessary for passengers to get off the train' - so lowering the height is not an option!
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