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IBS worked from box in advance

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

IBS worked from box in advance

Unread postby Main Line » Sat Jan 20, 2018 3:00 pm

Mike Hodgson wrote:Can't comment on the boxes in question, but yes it was relatively uncommon for IBS to be worked from box in advance. To work it from box in advance you need track circuiting through the whole section, not just the intermediate block section as with IBS worked by box in rear. And if you're going to track circuit the whole section, you might as well work TCB - in which case there's no such thing as an IB, although there may be other reasons (such as switching out arrangements) why you would still work AB.

In the Railscene cab ride from Glasgow Queen Street to Perth there appears to be an IBS in rear worked by Hilton Junction (presumably installed when Forteviot was abolished). They were also talking about Dunning being switched out (although it was then stated that Dunning was actually switched in at the time). Were there track circuits all the way back from Auchterarder or was there CCTV at the IBS?
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Re: IBS worked from box in advance

Unread postby Mad Mac » Sat Jan 20, 2018 5:56 pm

Forteviot was replaced by AHBs in 1985, I believe that the IBs came somewhat later. Also, Dunning supervised Whitemoss AHBs, so I believe it didn’t switch out.
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Re: IBS worked from box in advance

Unread postby Benhar Jnc » Sun Jan 21, 2018 11:39 am

I understood that prior to closure, Dunning could be switched out leaving the worked section as Auchterarder to Hilton Junction? The IBS were an attempt to help maintain the timetable after Forteviot had gone. One of the older signalmen at Hilton was unimpressed at the closure of Forteviot and then Dunning in terms of keeping the traffic running to the published timetable. The section between Auchterarder and Hilton Junction was viewed as 'too lengthy' when waiting for a late running clear back.

Heading the other direction there were/are a set of IBS for traffic heading from Dunblane towards Stirling North.
...... another trip working to the Dardanelles
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Re: IBS worked from box in advance

Unread postby Alan Norris » Tue Jan 23, 2018 1:06 pm

Benhar Jnc wrote:I understood that prior to closure, Dunning could be switched out leaving the worked section as Auchterarder to Hilton Junction? The IBS were an attempt to help maintain the timetable after Forteviot had gone. One of the older signalmen at Hilton was unimpressed at the closure of Forteviot and then Dunning in terms of keeping the traffic running to the published timetable. The section between Auchterarder and Hilton Junction was viewed as 'too lengthy' when waiting for a late running clear back.

Heading the other direction there were/are a set of IBS for traffic heading from Dunblane towards Stirling North.


IBS at Bridge of Allan in both directions.
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