SE13
In memoriam
RIP 23-Oct-2013
Glorious Gooner
Posts: 9,737
|
Post by SE13 on May 30, 2009 6:54:09 GMT
It's another single part question today:  *Click image for a larger version* |
|
|
|
Post by happybunny on May 30, 2009 7:27:10 GMT
Heron Quays ?
|
|
|
|
Post by yerkes on May 30, 2009 7:28:46 GMT
Haven't been on the DLR for a number of years now, but it's reminiscent of Island Gardens as originally built.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 30, 2009 7:43:05 GMT
West India Quay
|
|
metman
Global Moderator
5056 05/12/1961-23/04/2012 RIP
Posts: 7,421
|
Post by metman on May 30, 2009 9:13:29 GMT
+1
|
|
|
|
Post by uzairjubilee on May 30, 2009 9:41:12 GMT
+2. Is something on the train missing?
|
|
|
|
Post by astock5000 on May 30, 2009 10:31:25 GMT
+3. Yes, the DLR logo and number are missing for some reason.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 30, 2009 10:32:37 GMT
West India Quay +4
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 30, 2009 18:26:25 GMT
|
|
SE13
In memoriam
RIP 23-Oct-2013
Glorious Gooner
Posts: 9,737
|
Post by SE13 on May 31, 2009 6:29:43 GMT
West India Quay - new train launch day (13/03/2008), photographed from Canary Wharf.  *Click image for a larger version* |
|
rincew1nd
Administrator
Junior Under-wizzard of quiz
Posts: 10,286 
|
Post by rincew1nd on May 31, 2009 21:58:53 GMT
You forgot to reverse the coupler!  |
|
Chris M
Global Moderator
Forum Quizmaster
Always happy to receive quiz ideas and pictures by email or PM
Posts: 19,772
|
Post by Chris M on May 31, 2009 22:06:42 GMT
Oops! And to think I was impressed with myself for reversing the black on yellow sign at track level*  * I've always assumed these are code transmission points, is this correct? |
|
|
|
Post by cetacean on May 31, 2009 22:48:29 GMT
The code is transmitted constantly along the length of the track by a pair of wires. However, every 50m-ish the wires swap sides (which is what the signs mark) and a moving train detects and counts these. The transmitter for each run of wires (which include many side-swappings - sorry, don't know the technical names) transmits a unique code identifying the area.
So by decoding the transmission, the train knows definitively which area it's in and which track it's on. By counting the number of times the wires cross over as it moves, the train can identify where it is within that area, and by counting the turns of its wheels, it can know with a high degree of confidence where exactly it is between the crossings over of the wires.
|
|
Chris M
Global Moderator
Forum Quizmaster
Always happy to receive quiz ideas and pictures by email or PM
Posts: 19,772
|
Post by Chris M on Jun 1, 2009 2:33:58 GMT
But the signs are placed much closed together than every 50 metres - see this picture for example and don't appear to be evenly spaced. I don't know whether it's subjective or reality, but my perception has been that they occur more frequently on curved track than on straight sections? |
|
|
|
Post by cetacean on Jun 1, 2009 7:20:07 GMT
The signs mark where the wires cross over, so obviously some DLR pixie has worked out that a higher degree of accuracy is required in certain places.
On the issue of curves - the tachometer (axle turn counter) is going to be much less reliable, so perhaps they're compensating?
|
|
