Next train indicator Barking eastbound

Most indicators on the District Line only showed the next train after it left the last point it could be reversed. EG: after leaving say Whitechapel it would indicate at Stepney Green, Mile End, Bow Road, Bromley By Bow. West Ham would indicate after it left Bromley by Bow. Upton Park and East Ham after it left Plaistow. As for Barking should be when it leaves East Ham but the signaller can change the train and put it into the bay, the sidings so that indicator could easily be wrong. This is how it used to work, cannot say now but it sounds very similar.

The Barking indicators extract their information from Trackernet, but this doesn't continuously track trains between Plaistow and East Ham (or Dagenham East and Upney)so attempts to reconcile train radio details with which train is which and where it is going. This is a bit hit and miss and the system updates its self when its logic tells it which train is most likely which from the info it is receiving. It isn't brilliant and a train with a radio not logged in properly (or logged out early anticipating a crew change at Barking)completely throw it as do lots of trains in the blind area and trains where the destination is changed or where the destination TD feed has received the wrong info from Whitechapel box. The Barking e/b indicator will ignore trains expected to reverse via the bay but will show (as teminating) those expected to go via the sidings. The expectation depends upon the code it left Whitechapel with. All the other station indicators up that end of the line work in the way suggested by revupminster.