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Absolute Block Welwyn Controls

Current and future British signalling (UK except Northern Ireland)

Re: Absolute Block Welwyn Controls

Unread postby Eccles Road » Sat Dec 17, 2016 11:08 am

I worked the last shift at Farnham SB on the Wessex route, perhaps something like the 23rd August 2013. The box worked AB to Aldershot and there were no Welwyn controls. Still one L/C, one pull though.

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Owen
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Re: Absolute Block Welwyn Controls

Unread postby Fast Line Floyd » Sat Dec 17, 2016 12:51 pm

Eccles Road wrote:I worked the last shift at Farnham SB on the Wessex route, perhaps something like the 23rd August 2013. The box worked AB to Aldershot and there were no Welwyn controls. Still one L/C, one pull though.

Cheers,
Owen

Welwyn controls were rare on the former southern routes although other controls were often fitted including one that has a faint whiff of Sykes in that the section signal lever could not be returned to normal beyond the check lock position until the block was at TOL.
Graham
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Re: Absolute Block Welwyn Controls

Unread postby Chris Rideout » Mon Jan 2, 2017 1:32 pm

Fast Line Floyd wrote:Welwyn controls were rare on the former southern routes although other controls were often fitted including one that has a faint whiff of Sykes in that the section signal lever could not be returned to normal beyond the check lock position until the block was at TOL.

I think that some of the SR Westinghouse frames were set up as you say. The lever would be backlocked when the lever was reversed after receiving the LC release. This arrangement was changed in the post war years but the section signal had to be promptly replaced while the block indicator was in the TOL position. If not, you would not get a release when the next LC was pegged. With short sections, it was commonplace to accept by giving the commutator a twist to TOL, then turn it back to the normal position, then push the commutator release button and turn it to LC to allow it to work as intended. Such manipulation was commonplace on the Absolute Block portions of the former LSWR/SR line between St Denys and Totton where the block sections were very short.
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