Noted HSG
Deansgate Junction Signal Box
The signalling system power supply status/system failure alarms/indication failure notification panel in Deansgate Junction Signal Box circa 1995
There is also an emergency replacement of ALL signals button/control
In the event of activating the Emergency Signals On button it would momentarily drop/shunt every track circuit, throw every signal back to on/danger/caution, occupy every track circuit berth with an NDA (No Description Alarm Indication), place every level crossing into a lower mode & then send a distress emergency alarm to all neighbouring fringe interface boxes.
Basically an emergency stop button that would in effect kill all routes & stop ALL !! traffic movements within about 4 seconds or so.
As far as I'm aware it was never used in anger & the only time it got used was during routine system tests.
Deansgate Junction Signal Box
The signalling system power supply status/system failure alarms/indication failure notification panel in Deansgate Junction Signal Box circa 1995
There is also an emergency replacement of ALL signals button/control
In the event of activating the Emergency Signals On button it would momentarily drop/shunt every track circuit, throw every signal back to on/danger/caution, occupy every track circuit berth with an NDA (No Description Alarm Indication), place every level crossing into a lower mode & then send a distress emergency alarm to all neighbouring fringe interface boxes.
Basically an emergency stop button that would in effect kill all routes & stop ALL !! traffic movements within about 4 seconds or so.
As far as I'm aware it was never used in anger & the only time it got used was during routine system tests.