What causes a train to disappear off platform screens?

[fusionblue]

A few weeks back i'm standing at Catford was waiting for a train to London (this was on the day there was overruning engineering works at Sevenoaks, last month). An FCC app states it's delayed while the platform screen says its due to arrive in 3 minutes. It counts down to zero, then doesn't show a time to arrival, then goes blank, then disappears off the screen entirely and throws up the next train 32 minutes later.

No human or automated announcements about it. So i emailed SE and asked. They said:

If we need to divert a train at short notice because of an unexpected fault, the train information will disappear from the CIS, as the train is no longer stopping at its scheduled stations.

I struggle to see how this could be the case at short notice. CTF is in the middle of it's own loop line, it must be known before Nunhead or Shortlands that a train is diverted away (and you can't divert anywhere else in between). Plus, if a train is marked as one minute away on the screen then doesn't that suggest it triggered the most recent "circuit" to update to that time?

 

[D1009]

A few weeks back i'm standing at Catford was waiting for a train to London (this was on the day there was overruning engineering works at Sevenoaks, last month). An FCC app states it's delayed while the platform screen says its due to arrive in 3 minutes. It counts down to zero, then doesn't show a time to arrival, then goes blank, then disappears off the screen entirely and throws up the next train 32 minutes later.

No human or automated announcements about it. So i emailed SE and asked. They said:



I struggle to see how this could be the case at short notice. CTF is in the middle of it's own loop line, it must be known before Nunhead or Shortlands that a train is diverted away (and you can't divert anywhere else in between). Plus, if a train is marked as one minute away on the screen then doesn't that suggest it triggered the most recent "circuit" to update to that time?

It might help if you culd tell us whether the train actually arrived or not.

 

[fusionblue]

No, the train never arrived. (whoops!)

 

[westcoaster]

SE seem to have changed there CIS screens recently instead if saying due 10:38 they now count down as due 3 mins then seem to disappear after the due time, I don't think they are longer connected to real time running but set to the timetable. I was at Bellingham the other week after dropping of a unit in the sidings, went out for my booked train it was shown as 5 late on the national rail app, but the departure screen still said due in 5. Anyway at departure time the screen ticked over to the next service due in 30 mins.

 

[D1009]

I don't frequent South Eastern, but where I live when short notice alterations are made, it often takes the CIS a while to catch up with them.