Chiltern ATP switched off

[d7666]

Not too sure where to put this, but it is Met line connected, and subject has been discussed in here before.

Chiltern ATP was turned off overnight last night (e.i. night of 19-20/05/23). I knew for some time they were going to decommission it but didn't know it was last night until posted on another forum (WNXX and acknowledged).

While the ATP system was not fitted on any of the LU infrastructure, it is Met line relevant where the class 16x units enter and exit the LU area.

<<rincew1nd: The signalling board is probably the most relevant, I've tidied the thread title though.>>

[zbang]

ATP? (I'm not up on all the acronyms and initialisms.)

[spsmiler]

My first thought was that this is a bad move, but then I realised that I do not actually know the reason for this and maybe something else is replacing it? eg: a technology that offers the same safety protection which is also used on other Network Rail routes?

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my understanding: ATP = Automatic train protection - stops a train that passes a signal at danger. Installed on services out of Marylebone during the total route modernisation when the Networker Turbo trains were introduced.

[t697]

Enhanced TPWS appears to be the replacement. This article suggests that as implemented it is as safe as the superseded ATP; www.railengineer.co.uk/chiltern-atp-obsolescence/

TPWS = Train Protection and Warning System

[jimbo]

The report on a signal passed at danger and subsequent near miss at Chalfont & Latimer station on 21 June 2020 mentioned that Chiltern Trains were fitted with three other signalling safety systems apart from the trainstop/tripcock system. And yet that is to be retained for Harrow - Amersham with the current resignalling.