All the screens on the Hounslow loop are showing delayed this morning but the trains are running normally. The SWR site is useless and there are no Tannoy announcements. Another shambolic state of affairs.
The information screens are driven by data feeds from the SWR timetable database and the Network Rail database and train monitoring systems. ( Comparing timetabled and actual running times to give minutes delay.) los of any one system or its' data links and the whole Customer Information System for that area sulks.
The signalling around Hounslow dates back about 50 years and is planned to be replaced soon. The problem is the added on information systems , sometimes not quite coping with the analogue technology.
PS Tannoy announcements are automated as well. There is thread on here complaining about the diction/speed/bored tone of voice.