Heat affectng atp

[nlt]

Twice today I’ve witnessed trains stopping short whilst entering platforms at Marylebone. A driver says it’s the heat affecting “ATP”.

 

[LCC106]

Can you give us a bit more detail? Which platforms? What happened? What the driver said? Whether or not the investigation team (if any) agree?

== Doublepost prevention - post automatically merged: 13 Aug 2022 ==

When you say stopping short what do you mean? Did they finish the journey there or did they progress into the platform? Lots of basic info required here methinks.

 

[nlt]

Platforms 5 and 3. Both stopped well before the buffers. Then after abt 30 secs the drivers restarted and drove to usual stop position. I wouldn't know abt an investigation. I was only a passenger mate.

 

[MarkyT]

Marylebone, along with much of the route mileage used by Chiltern Railways, is equipped with an automatic train protection system known as Selcab, a simplified intermittant system adapted from German LZB technology, and also related to SelTrac as used by London Underground on various lines and on the DLR. It was provided originally in the late 1980s/early 90s as part of a BR pilot scheme to assess different train protection technologies but is now considered obsolete. Neither Selcab nor the rival ACEC system trialled on the GWML were taken forward to be installed elsewhere as it was clear such proprietary systems were a technical dead end in the light of open standard ETCS developments and were considered unreasonably expensive as interim measures compared to the alternative of TPWS, which eventually was rolled out nationally. Network Rail plans to replace both obsolete pilot systems with something else in the future. In the meantime, it's quite possible that some of the trackside or on-board equipment is struggling with the heat, causing these problems.

 

[Skie]

Lots of equipment boxes all over the place running their fans at 100% and still not cooling down. Surprised more things haven't gone 'pop' given how hot it has been consistently over the last few days.

 

[LiftFan]

Lots of equipment boxes all over the place running their fans at 100% and still not cooling down. Surprised more things haven't gone 'pop' given how hot it has been consistently over the last few days.

TPWS round here is particularly prone to failure in the heat- they installed the modules in sealed metal boxes with zero ventilation and the modules just completely overheat and give up!

 

[Trackman]

I think the driver should have put in more simplistic terms for the pax.
I've heard this before on train announcements with complicated explanations for the pax, rather than we'll be moving in about 5 mins (that's all they want to hear).

 

[43066]

I think the driver should have put in more simplistic terms for the pax.
I've heard this before on train announcements with complicated explanations for the pax, rather than we'll be moving in about 5 mins (that's all they want to hear).

Except then people come on here or go onto Twitter demanding to know more!

 

[ComUtoR]

I think the driver should have put in more simplistic terms for the pax.
I've heard this before on train announcements with complicated explanations for the pax, rather than we'll be moving in about 5 mins (that's all they want to hear).

Like not using "technical phrases" or "slang" terms... Like pax ?

 

[nlt]

There wasn't a driver announcement. I asked a driver what was happening.