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Post by orienteer on Aug 23, 2007 11:48:40 GMT
At Ruislip westbound, high on the road bridge pier at the front of the platform, is what looks like a sensor pointing down towards the track/train. It is labelled TMD2.
Anyone know what this is exactly? It has been puzzling me for ages!
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Post by Deleted on Aug 23, 2007 16:31:08 GMT
Something to do with detecting either Pic or Met Stock, probably...
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Post by ruislip on Aug 23, 2007 22:18:58 GMT
Could it have to do with routing reversers to the siding between Ruislip and Ickenham?
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Post by Harsig on Aug 24, 2007 5:48:30 GMT
When I asked what it was for I was told that it is used to detect the presence of trains in the platform for the purposes of adjusting the volume of the automatic public address announcements.
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Post by jamesb on Aug 24, 2007 19:16:41 GMT
Yes, I've seen them too. Did it have a green plastic ring around it towards the end? And was it at an upgraded station, with the white speakers? Maybe its part of the PA system? If it is what I think, you can just about see one in this photo at Loughton taken from a previous quiz (attached to the pole with 4 speakers); although it is quite box-shaped, i've seen smaller ones with just a probe too. www.sucs.org/~cmckenna/photos/quizes/tq2/August/Aug07.jpg |
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Post by Deleted on Aug 26, 2007 6:42:10 GMT
This equipment is also in place at Bromley By Bow.
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Post by Deleted on Aug 31, 2007 22:32:50 GMT
Ah, there's something labelled TMD at Oakwood, I assumed it must stand for Train Monitoring Device but the supervisor I asked wasn't sure exactly what it was for and I'd almost forgotten about it, actually. It emits a quite odd noise.. not even sure how to describe it, a sort of ticking, buzzing noise.
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