Train noise over points / crossovers

[jetblast787]

I noticed on this site that one of the works involved include the plain lining of the points around the British Museum siding. Will this be reinstated or is this siding being decommissioned for good?

[nickf]

I have noticed on the YouTube videos of cab views of Underground and Main Line railways that passing crossovers and points usually creates far more noise on Underground trains than on the Main Line trains. I suppose this could mean less audio insulation in the cabs of Underground trains; or the gaps that the wheels have to cross are wider on Underground points and crossovers; or I am imagining it all! Any thoughts?

[Chris M]

If you are talking about tube stock, then part of the reason could be that you are simply closer to the track than you are in a mainline train.

[stapler]

Also of course they are more complex than NR, especially when the shoes set up sparking on the 3rd and 4th rails, the configuration of which on P&C is complex!

[bassmike]

Also if you are in tunnel.the noise is more concentratd

[superteacher]

As well as the sound being reflected back off the tunnels.

[domh245]

I suppose that a fair bit of noise is contributed by the pickup shoes clattering as they hit the juice rails (and wooden ramps) which can soon add up if it is somewhere like Parsons Green

clicky

[nickf]

Thanks for the answers, chaps. That all makes sense.

[Deleted]

Plus with Bullhead rail the joints are not as smooth and usually they are quite slow speed moves mostly on LU compared to points on NR which can have a lot higher speeds as the switches are usually longer.

[philthetube]

also with tube stock being closer to the ground there is less room for suspension which would absorb some of the noise.