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The tunnel is described as "climbing towards Bath" but this means that the line is climbing away from its summit toward the River Avon although it crosses the latter on a fairly low bridge. Ir also has the accidental runaway mentioned doing so in uphill. I suspect it is wrong. Britmax 18:30, 11 November 2007 (UTC)
The summit (of this section of the line) is just at the north entrance to the tunnel, so the article is right. Trains were often banked up from Bath to the tunnel entrance; the banking engines then reversed back down the slope into Bath while the train proceeded downhill inside the tunnel and then down the valley to Midford. The slope northbound from Midford to and through the tunnel wasn't steep enough to require banking. Johnlp 18:46, 11 November 2007 (UTC)
What is Gradient of of tunnel, which AFAIK climbs away from Bath? Tabletop ( talk) 05:09, 8 October 2011 (UTC)
.
Why was the long tunnel built with two gradients, 1 in 100 and level, instead of a more gentle 1 in 131 average ??
"This operation was a very rare example of two trains being permitted to run within a single-line section ...."
Since the train and the bank engines, when separated, operate in opposite directions, there is no risk of a collision, and therefore the above quote about "two trains" is misleading.
When two trains are allowed in a section in the same direction, whether double or single line, mostly only goods trains, this is called "permissive working".
Since the 1 in 100 Combe Down Tunnel was half the ruling gradient of 1 in 50, one might expect that fume problems would not always occur.
Other factors:
Exactly how gentle the tunnel gradient would need to be guarantee no fume problems is hard to say. Tabletop ( talk) 03:13, 1 May 2013 (UTC)
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That 'The tunnel portal in 2013' photo isn't a shot of Combe Down Tunnel.. Dave F63 ( talk) 11:31, 19 January 2023 (UTC)
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The tunnel is described as "climbing towards Bath" but this means that the line is climbing away from its summit toward the River Avon although it crosses the latter on a fairly low bridge. Ir also has the accidental runaway mentioned doing so in uphill. I suspect it is wrong. Britmax 18:30, 11 November 2007 (UTC)
The summit (of this section of the line) is just at the north entrance to the tunnel, so the article is right. Trains were often banked up from Bath to the tunnel entrance; the banking engines then reversed back down the slope into Bath while the train proceeded downhill inside the tunnel and then down the valley to Midford. The slope northbound from Midford to and through the tunnel wasn't steep enough to require banking. Johnlp 18:46, 11 November 2007 (UTC)
What is Gradient of of tunnel, which AFAIK climbs away from Bath? Tabletop ( talk) 05:09, 8 October 2011 (UTC)
.
Why was the long tunnel built with two gradients, 1 in 100 and level, instead of a more gentle 1 in 131 average ??
"This operation was a very rare example of two trains being permitted to run within a single-line section ...."
Since the train and the bank engines, when separated, operate in opposite directions, there is no risk of a collision, and therefore the above quote about "two trains" is misleading.
When two trains are allowed in a section in the same direction, whether double or single line, mostly only goods trains, this is called "permissive working".
Since the 1 in 100 Combe Down Tunnel was half the ruling gradient of 1 in 50, one might expect that fume problems would not always occur.
Other factors:
Exactly how gentle the tunnel gradient would need to be guarantee no fume problems is hard to say. Tabletop ( talk) 03:13, 1 May 2013 (UTC)
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That 'The tunnel portal in 2013' photo isn't a shot of Combe Down Tunnel.. Dave F63 ( talk) 11:31, 19 January 2023 (UTC)