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Liskeard - closing switches

British signalling of the past (UK, excepting Northern Ireland)

Re: Liskeard - closing switches

Unread postby Fast Line Floyd » Thu Feb 16, 2017 11:47 am

S&TEngineer wrote:......another spanner in the works. All the TCB section SPTs went to Lostwithiel box which controlled the Lostwithiel-Largin-Liskeard (exclusive) section. Only the Up Home at Liskeard had a telephone to Liskeard box.

But that would still have to be switched through.
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Re: Liskeard - closing switches

Unread postby Nick Allsop » Sat Feb 18, 2017 8:54 pm

Liskeard hasn't been able to switch-out since the abolition of Largin in 1991, Lostwithiel is the first place with AB on the GW main line these days...
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Re: Liskeard - closing switches

Unread postby John Hinson » Sun Feb 19, 2017 2:28 am

Nick Allsop wrote:Liskeard hasn't been able to switch-out since the abolition of Largin in 1991, Lostwithiel is the first place with AB on the GW main line these days...

Interesting! Then why did these switches exist in 1994?

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Re: Liskeard - closing switches

Unread postby JRB » Sun Feb 19, 2017 11:41 am

Banbury North could not switch out after Fenny Compton closed. No one could justify the bother and expense of taking out the block switch.
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Re: Liskeard - closing switches

Unread postby davidwoodcock » Sun Feb 19, 2017 2:30 pm

JRB wrote:Banbury North could not switch out after Fenny Compton closed. No one could justify the bother and expense of taking out the block switch.


Which could explain why the ones at Liskeard didn't seem to be labelled.
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Re: Liskeard - closing switches

Unread postby John Hinson » Sun Feb 19, 2017 4:59 pm

It doesn't explain why there are two, though, when there weren't before.

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Re: Liskeard - closing switches

Unread postby Fast Line Floyd » Mon Feb 20, 2017 10:17 am

Nick Allsop wrote:Liskeard hasn't been able to switch-out since the abolition of Largin in 1991, Lostwithiel is the first place with AB on the GW main line these days...

Just because the line is track circuit block both ways does not prevent it closing out so is there another reason why it can't close? Normally only a box with dissimilar block working would not be able to close (without closing the line that is).
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Re: Liskeard - closing switches

Unread postby John Hinson » Mon Feb 20, 2017 10:57 am

Good point. Is the box fully colour-light now? If it still has semaphores, that could be a complication.

But just to be clear, at the date of the photograph of the two switches, the box appeared to be AB in one direction and TCB in the other. I believe there is (or was) a directive that in such cases, mixed working was not approved of and AB should be used at all times - maybe that was the reason the switches weren't used?

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Re: Liskeard - closing switches

Unread postby S&TEngineer » Mon Feb 20, 2017 2:52 pm

John Hinson wrote:Good point. Is the box fully colour-light now? If it still has semaphores, that could be a complication.

No. Only the distants are colourlights, all other signals remain as mechanical semaphores.
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Re: Liskeard - closing switches

Unread postby colin1501 » Mon Feb 20, 2017 5:13 pm

I believe the up advanced starter is a colour-light, and has been for a few years.

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Re: Liskeard - closing switches

Unread postby S&TEngineer » Mon Feb 20, 2017 5:59 pm

colin1501 wrote:I believe the up advanced starter is a colour-light, and has been for a few years.

Appologies, you are correct. I'm getting a bit confused about what period in time we are talking about. The Up Starting became a colourlight when St.Germans was aboilshed in 1998.
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Re: Liskeard - closing switches

Unread postby John Hinson » Mon Feb 20, 2017 6:53 pm

Whichever, with semaphores it would make switching out on TCB complicated.

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Re: Liskeard - closing switches

Unread postby Mike Hodgson » Mon Feb 20, 2017 9:14 pm

Might it have been installed as part of some sort of stage works, overlooked/not worth the bother of recovering?
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Re: Liskeard - closing switches

Unread postby Fast Line Floyd » Tue Feb 21, 2017 10:37 am

John Hinson wrote:Whichever, with semaphores it would make switching out on TCB complicated.

John

On a busy piece of railway potentially yes but down there all you would need is all tracks clear from the Home overlap to section signal (wrong term but it will suffice) overlap to be clear on both lines at the same time so that all the running signal can be pulled.
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Re: Liskeard - closing switches

Unread postby John Prytherch » Fri Mar 10, 2017 12:15 am

I think there are two switches at Pontrilas, linked by a bar. I recall being told that on one occasion (in the late 1960s), shortly after the provision of the two switches, by mistake only one was operated so that either the block instrument circuits or the telephone circuits (but not both) were switched through; result chaos!

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