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Tunnel signals and gongs

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Re: Tunnel signals and Gongs

Unread postby B.P.Mills » Sun Jan 21, 2018 12:24 pm

In the 1960s, some of the South Wales tunnels, e.g. Merthyr (or Abernant),and Caerphilly, still had treadle-activated clappers fitted to warn drivers that they were approaching the end of the tunnel that they were travelling through and yes, every wheelset that passed the treadle caused the clapper to sound. Such were quite audible to passengers aboard trains. The single line Merthyr tunnel placed one clapper 226 yards from the tunnel mouth at the Rhydycar Jct end and 220 yards from the mouth at the Werfa Loop end. The Caerphilly tunnel had just one clapper placed in the down line only and at 200 yards from the mouth at the Cardiff or south end.
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Re: Tunnel signals and gongs

Unread postby S&TEngineer » Tue Jan 23, 2018 4:48 pm

The Snow Hill 'Clapper' is described down the page here: http://www.warwickshirerailways.com/gwr ... m#electric

GREAT WESTERN RAILWAY
Appendix to No. 13 Section of the Service Time Tables
(Aynho Junction, Birmingham, Wolverhampton and North Warwickshire Line)
.....................................................................

MARCH 1929, and until further notice
BIRMINGHAM (SNOW HILL)
CLAPPER IN SNOW HILL TUNNEL
For the purpose of intimating to Enginemen of Down Trains passing through Snow Hill Tunnel that they are nearing the North End of the Tunnel, a Clapper has been fixed on the Down line side about 150 yards from the Snow Hill end of the Tunnel, which is operated by means of a treadle. Every pair of wheels passing over the treadle will sound the Clapper.

Should the Driver of a Down Train notice any defect in the working of the apparatus, he must inform the Station Master or Platform Inspector at Snow Hill station, if necessary stopping specially for the purpose.
Regards,
S&TEngineer
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Re: Tunnel signals and gongs

Unread postby John Hinson » Wed Jan 24, 2018 3:35 am

S&TEngineer wrote:"Should the Driver of a Down Train notice any defect in the working of the apparatus, he must inform the Station Master or Platform Inspector at Snow Hill station, if necessary stopping specially for the purpose."

. . . which assumes the driver isn't running out of control because he couldn't tell where the exit of the tunnel was!

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