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Post by t697 on Oct 1, 2023 23:08:35 GMT
If we are going to smaller and smaller increments, what's the gradient at the worst dipped rail joint? :-)
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Tom
Administrator
Signalfel?
Posts: 4,196 
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Post by Tom on Oct 2, 2023 13:49:53 GMT
I also have very vague memories of something like 1 in a single digit over a distance of a few inches to get wheels over the running rail as part of trap points somewhere. I want to say Tower Hill/Minories sort of area but could be completely wrong. There were lifts like that on the old unbroken crossing noses for trains running towards the trap road, on one rail only. I don't think the track engineer would count it as a gradient though. Worth also remembering that the track engineers use "1 in x" to measure angles of crossings, rather than degrees, so it might have been a reference to the crossing angle rather than a gradient. (Edit: Just found the drawing and the rise was 1 in 80 and fall at 1 in 60 but they were both over quite short distances - the rail had to rise to 1 3/4" above the main line rail.) |
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Post by bigal on Nov 15, 2023 7:53:56 GMT
Something nearly irrelevant.
As a PG driver in the very early 70’s I remember taking a 6 car R stock WB up the bank out of Hammersmith on just the leading motor for no better reason than to see if it could be done. It could. Some years later, mid 70’s I guess, I was driving out of GG on the Northern. The gradient from GG to Brent was marked trackside as 1:39. The 38 tube stock handled that just fine – even fully loaded.
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