Northern line broken down train at Kennington today

[Techandtrains]

Northern line had a no service on the BPS extension, and no Southbound service between Charing Cross and Kennington from 1215 till 1915 today due to "a faulty train at Kennington"

Anyone have more info on the train fault?

 

[Dstock7080]

1215: southbound train came to stop one-car short of platform 2 (Charing X branch).
air escaping causing heavy dust cloud.
service suspended southbound Charing Cross-Battersea; northbound Battersea-Kennington.
Two trains stalled behind defective train in section. These were both wrong-roaded back to Waterloo, arriving 1305 and 1325.

Train Operator unable to rectify defect, Train Technician accompanied to site with Duty Manager, traction current off.
Isolations of mainline pipe unsuccessful. Air still fails to build.
After movement of stalled trains above, passengers detrained forward to Kennington station 1345.

Push-out of defective train to Morden arranged. Both trains arrived pfm.2 1540. Concerns around integrity of coupler and gapping issues.
Decision taken to isolate SAPB Spring Applied Parking Brake on defective train and clear Line of trains direct to Morden.
Trains moving 1755. Service resumed to Battersea via Charing X 1815, Kennington via Bank 1815.
Incident train arrived Morden depot 1910.

 

[bramling]

1215: southbound train came to stop one-car short of platform 2 (Charing X branch).
air escaping causing heavy dust cloud.
service suspended southbound Charing Cross-Battersea; northbound Battersea-Kennington.
Two trains stalled behind defective train in section. These were both wrong-roaded back to Waterloo, arriving 1305 and 1325.

Train Operator unable to rectify defect, Train Technician accompanied to site with Duty Manager, traction current off.
Isolations of mainline pipe unsuccessful. Air still fails to build.
After movement of stalled trains above, passengers detrained forward to Kennington station 1345.

Push-out of defective train to Morden arranged. Both trains arrived pfm.2 1540. Concerns around integrity of coupler and gapping issues.
Decision taken to isolate SAPB Spring Applied Parking Brake on defective train and clear Line of trains direct to Morden.
Trains moving 1755. Service resumed to Battersea via Charing X 1815, Kennington via Bank 1815.
Incident train arrived Morden depot 1910.

Would be interested to know how the spring applied parking brake was “isolated”, as this isn’t possible.

 

[Dstock7080]

Would be interested to know how the spring applied parking brake was “isolated”, as this isn’t possible.

It is with a Train Technician in attendance.
As an Operator I was shown how to release them on D Stock in extreme circumstances

 

[rebmcr]

Would be interested to know how the spring applied parking brake was “isolated”, as this isn’t possible.

"Possible" is a relative term.

On an industrial machine, or on a road vehicle, this would be done by using a clamp or strap to wind the brake shoes back, then inserting a pin or block to prevent its return.

Alternatively by disassembling and/or removing the brake entirely.

It's a similar concept to 'scotching' secured pointwork.

 

[christopher]

Not sure on trains but I know on buses you have to have the air built up and handbrake released to wind off the spring brakes normally otherwise it's very hard to do, much harder on a train I'd imagine.

 

[bahnause]

Would be interested to know how the spring applied parking brake was “isolated”, as this isn’t possible.

I have never seen a case where this would not be possible. It normally only takes a few minutes. Of course, if all the parking brakes on the train are affected, it can take a little longer... One of the most important cases in our train driver training on every unit. Everyone gets their fingers dirty.

 

[Central]

We were told when SAPBs first came in train can move if an air burst puts brake on after the appropriate isolations were done.

 

[TripleValve]

Just a little extra information. The fault has been traced to a wiring issue which was causing the train to constantly "trip down". This stopped the compressors working hence no air. And yes after certain isolations are made, the SAPB's can be isolated.