Seems that the fault is on more than just the desiros. I've noticed alot of 455s with the same fault too. This message has appeared on the journeycheck page now too. http://m.journeycheck.com/southwesttrains/incidentDetail?fHome=true&incidentCount=18&from=&to=&savedRoute=&incidentsType=OTHER_INCIDENT&id=1296977558&webMsg=false&engWorksPeriod=&serviceTime=
Passenger Information System - Clock Fault
We have recently identified a fault with our on-board information systems that means our trains are not displaying the correct time on their interior information displays.
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The clocks on all of our trains are linked to the GPS system used to identify when they are arriving at a station. A fault has recently developed which means that the GPS receivers on board are unable to process the data received to calculate the current time and date.
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Our engineers are working on a software update for our trains to resolve the problem, and we are hoping to implement this within the coming weeks.
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We are sorry for any inconvenience this fault causes to your journey today.