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Post by Deleted on Oct 13, 2006 10:35:04 GMT
I was browsing through Tubeprune's website and came across his articles on the Victoria Line. Whilst reading them I came across this very interesting system called 'Identra'.
Is 'Identra' one of the ancestors of the PTI experiment on the Northern?
Also, how exactly does it work? I'm guessing that it works in a similar fashion to the PTI.
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Post by Deleted on Oct 13, 2006 16:36:45 GMT
I was browsing through Tubeprune's website and came across his articles on the Victoria Line. Whilst reading them I came across this very interesting system called 'Identra'. Is 'Identra' one of the ancestors of the PTI experiment on the Northern? Also, how exactly does it work? I'm guessing that it works in a similar fashion to the PTI. Answering only at a user level, not a technical one. A circular dial mounted on the roof of 1967 stock driving cabs, it turned, so the pointer is pointing at the destination of the train. Only formal reversing points are available for selection along with seperate displays for "Walthamstow Sidings" "Brixton sidings" "Northumberland Park Depot" "Northumberland Park Staff" "Special" Then at selected locations along the Victoria Line (At all the controlled areas, about one car length into the tunnel after the stations), a tunnel roof mounted piece of equiptment "reads" the pointer display and in turn generates the destination on Dot matrix Indicators and sends the display to Coborg Street control room. (Obviously NPS, NPK and SS show seperately as displays at Coborg Street, but all generate a "Seven Sisters" display on a platform Dot matrix Indicator) Connections enable the depot staff to disable the equiptment in a middle cab to prevent false readings. This is the best picture I can find atm - not that good I'm afraid !  |
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Post by coyote on Oct 13, 2006 18:31:00 GMT
Identra uses a selection of frequencies around 100kHz to differentiate between destinations. PTI is based on 90 and 100 Khz for 0 and 1 in a digital data messages.
An experiment when the Victoria line opened was the Train Number Reader system which consisted of an early form of barcode and reader; the barcode was on the side of the leading car, approx 10ft by 1ft in size.
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