Post by tut on Mar 23, 2021 8:56:39 GMT
I've got a question about the operation of the signalling at the east end of the Piccadilly Line when it was still at Earl's Court.
I understand that when the new computerised signalling was put in in the 1980s it was controlled from a separate desk 5 in its own little room at Earl's Court. The yellow peril doesn't go into very much detail but I understand routes were able to be set manually if required, but operation was generally by local site computer. One imagines, based on later installations such as Wood Lane and New Cross, that facilities were provided for editing the timetable a particular train was running to in order to make the computers do something else with the train, such as reverse it at Wood Green. I suppose other options were also available too like automatic reversing and automatic through working?
In any case, I understand desk 5 would later 'close' and the main control room was provided with a flashy computer display of the area (picture). I find the information displayed a bit bizarre but what do I know. I naturally assumed that the controls came with it, although presumably all from a desktop computer or something these days (well those days) and one is visible in the picture. However I read somewhere that the monitors are for display purposes only and I got the distinct impression the person was saying that there are no longer any facilities for interacting with the system. Either you let the computers control the area entirely by themselves with no input from anyone, even during disruption, or full-blown local control must be taken. Probably it was my misunderstanding as that seems a ... bold call for the time. But I do wonder, before PICU etc., how was the signalling operated. Was there a desk for it and, assuming there was, was it then generally unstaffed except when required?