neilw
now that's what I call a garden railway
Posts: 284
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Post by neilw on May 10, 2017 9:30:53 GMT
Hello everyone, we need something like this Current Rail Indicating Device for our depot at the tramway museum. Anyone know the supplier or similar details? many thanks
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Deleted
Deleted Member
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Post by Deleted on May 10, 2017 13:28:40 GMT
Tubelines had them designed and installed P-CRID's are not on SSL or BCV apart from where areas are shared track with JNP
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Post by countryman on May 10, 2017 14:05:10 GMT
Tubelines had them designed and installed P-CRID's are not on SSL or BCV apart from where areas are shared track with JNP Sorry, I can figure CRID apart from the P, and SSL, but not BCV or JNP! Are these common acronyms? |
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Chris M
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Post by Chris M on May 10, 2017 14:09:48 GMT
SSL, BCV and JNP are/were the three divisions the infrastructure maintenance was split into for PPP named for the lines they would look after (generally speaking at least). SSL = Sub-surface Lines
BCV = Bakerloo, Central and Victoria
JNP = Jubilee, Northern and Piccadilly
Metronet won the SSL and BCV contracts, Tubelines won the JNP contract.
I can't help with P-CRID.
edit: PPP = Public-Private Partnership, the ill-fated outsourcing of London Underground maintenance.
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rincew1nd
Administrator
Junior Under-wizzard of quiz
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Post by rincew1nd on May 10, 2017 14:16:47 GMT
I think the P in P-CRID is for permanent, as they are permanent installations, opposed to the temporary ones that that gangs carry with them.
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Deleted
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Post by Deleted on May 10, 2017 14:19:06 GMT
P-CRID = Permanent- Current Rail Indicator Device
These were fixed either by the track or on a tunnel segment
They have 3 indications OFF ON FAULT
They are permanently connected to the traction rails and were only used by JNP Tubelines staff upto approx 5 years ago when LU started to add the training to the relevant track courses.
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Deleted
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Post by Deleted on May 10, 2017 14:22:50 GMT
A normal CRID is a 2 orange boxes with 4 sets of 3 flashing LED's on one box to when flashing well more like a pulse indicates that traction is on.
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Post by crusty54 on May 10, 2017 14:40:24 GMT
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Deleted
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Post by Deleted on May 10, 2017 15:44:44 GMT
£890 then a yearly calibration check at additional £150 from Lillie Bridge so P-CRID's long term can be a cost saving.
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Post by norbitonflyer on May 10, 2017 16:54:02 GMT
I can't help with P-CRID. Doesn't the thread title give it away? |
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Post by domh245 on May 10, 2017 17:00:05 GMT
I can't help with P-CRID. Doesn't the thread title give it away? It does now that MoreToJack has de-acronymed it for us. |
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class411
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Post by class411 on May 10, 2017 17:49:48 GMT
Doesn't the thread title give it away? It does know that MoreToJack has de-acronymed it for us. Glad he did. As far as I knew it was a Programme Content Reference IDentifier. as opposed to a As far as I knew it was a Series Content Reference IDentifier. (They are something sent with digital TV signals to enable PVR's to work.) Nowadays, even doubly extended TLA's are being reused! |
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Post by crusty54 on May 10, 2017 18:25:08 GMT
£890 then a yearly calibration check at additional £150 from Lillie Bridge so P-CRID's long term can be a cost saving. but there have been false indications on some P-CRIDS |
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Deleted
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Post by Deleted on May 10, 2017 19:00:29 GMT
I didn't say they were perfect nothing is can't beat a true analoge multimeter though
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cso
Posts: 1,043
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Post by cso on May 10, 2017 19:29:56 GMT
I didn't say they were perfect nothing is can't beat a true analoge multimeter though Only if you have it plugged in the right way around... |
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Post by bassmike on May 11, 2017 9:38:40 GMT
If you "plug in" an analoge meter in the "wrong way round" you should'nt be using one
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roythebus
Pleased to say the restoration of BEA coach MLL738 is as complete as it can be, now restoring MLL721
Posts: 1,275
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Post by roythebus on May 11, 2017 9:54:47 GMT
If you "plug in" an analoge meter in the "wrong way round" you should'nt be using one One BT engineer at the Model Railway Club one night was testing the O gauge layout for a fault. He found loads, diodes the wrong way round and the like. Until someone pointed out he had the leads plugged in the wrong way round... |
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Post by brigham on May 11, 2017 14:27:24 GMT
The portable CRID is generally known as a 'box of bulbs'.
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Deleted
Deleted Member
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Post by Deleted on May 11, 2017 14:43:34 GMT
They are no longer bulbs and haven't been for at least 25 years now
They have been Neon style lamps and now LED's
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Post by brigham on May 11, 2017 16:11:43 GMT
Nothing stays the same.
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Deleted
Deleted Member
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Post by Deleted on May 12, 2017 19:46:01 GMT
Aren't you supposed to also affix a shirt-circuiting bar between the positive and negative live rails immediately after testing that the track is indeed dead - leaving it in place until the work is completed???
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Deleted
Deleted Member
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Post by Deleted on May 12, 2017 21:21:03 GMT
Nope they are only used in emergencys and are last resort to make sure the traction stays off between the 2 bars
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