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Post by fish7373 on Oct 31, 2016 13:36:53 GMT
Hi informed today that the D78 RAT Train this morning in Northfields depot sorry no photo i`am on sick leave. FISH7373 81C NFP
<<rincew1nd: Tautology removed from thread title>>
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Post by fish7373 on Oct 11, 2016 22:21:20 GMT
Battery locos hauled the Cravens set on the Epping - Ongar Railway with passengers last year schoma diesel did the pulling and pushing on the Epping-onar railway FISH7373 81C NFP
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Post by fish7373 on Jul 7, 2016 21:16:23 GMT
Hi the rat is in northfields depot for wheel turning FISH7373 81C NFP
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Post by fish7373 on Apr 29, 2016 20:25:35 GMT
At the moment have some teething problems i think FISH7373 81c NFP
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Post by fish7373 on Apr 16, 2016 0:37:03 GMT
Weren't these some of the units that were given an interior refurbishment and new style of Moquette to go with it? The 1973 tube stock had this Moquette fitted. FISH7373 81C NFP
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Post by fish7373 on Apr 16, 2016 0:13:54 GMT
Hi I saw this post on Facebook of a 1959 stock at Uxbridge sometime in the 1970s the train number is 32 somthing. Does anybody have any ideas to what it might of been doing on the line. Cheers HI i started work at northfields depot in 1978 the picc run 59 stock and 1973 stock in service then, unless it was a test train. FISH7373 81C NFP
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Post by fish7373 on Feb 28, 2016 19:29:19 GMT
Heathrow loop on the picc line some times noisy going round it because one way round traffic the rail on one side that goes out of profile then they have to send in the rail grinder. FISH7373 81C NFP
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Post by fish7373 on Feb 18, 2016 12:33:06 GMT
Looks like the train is only doing 1 mph in the video FISH7373 81C NFP
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Post by fish7373 on Feb 7, 2016 23:47:09 GMT
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Post by fish7373 on Feb 6, 2016 22:19:36 GMT
HI yes i have them just got to work out how to load them on here.FISH7373 81C NFP
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Post by fish7373 on Feb 5, 2016 12:13:40 GMT
I think its so the drivers keep their route knowledge of the district line or a cock up on the picc. FISH7373 81C NFP
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Post by fish7373 on Feb 4, 2016 22:35:06 GMT
All the wagons have through wiring to allow multiple unit control. and the whole train is braked. But very often the multiple jumps are not plugged in they will have two drivers one at each end one loco pulling and the other one pushing. the back drive will look at the duplex gauge when to shut off power. FISH7373 81C NFP
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Post by fish7373 on Feb 3, 2016 1:18:51 GMT
1973 t/stock grid FISH7373 81C NFP
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Post by fish7373 on Feb 3, 2016 0:57:18 GMT
So in this photo from left to right I can see what look like two document holders jutting out under the second door from the front followed by two grey boxes under the front window - these contain line breakers and PBs (PBs? ) citytransport.info/Digi/P1240580a.jpgWhilst on the other side from left to right are two grey boxes under the front window again plus one long box under the second door and roundel - this large box contains the RPA (ie the main camshaft that controls series/parallel/field weakening contactors? ). s68.photobucket.com/user/1288gaje/media/Thameslink%20Day-Save/ThameslinkDay-SaveMeet200021.jpg.htmlAnd the traction resistance grids (NOT braking resistors) are right underneath the frame in the middle out of sight? Are there any photos about of the field weakening and traction control resistors about at all? I hope I've understood all of this correctly!! Aidan. HI as i said from the front to the second set of doors the two grey boxes with white labels have relays in them, this side of train in photo the large box contain no RPA it is on the other side of the car. there are three banks of grids underneath the frames in the middle out of sight for traction and rheo braking . i will have to see on putting some illustrated parts on here if i can. FISH7373 81C NFP
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Post by fish7373 on Feb 2, 2016 22:22:38 GMT
Pretty much!! Regarding the resistance grids, whereabouts on this photo might they be located and do you know what they look like? Are the field weakening resistors in the same location? Aidan. If you look at the front carriage, imbetween the two bogies there are some grey box covers and a black tube. The resistors are located it a big bank of three sets behind the grey box covers. This is repeated in the undm (8--- numbered car). HI the two grey box covers have relays in them FISH7373 81C NFP HI in the photo you see the side of train is number 1 equipment case with the line brakers and the PBs and the shed box for the overhead trolley lead, the resistance grids are between the center of the frames of the car on the other side of the car is number 2 equipment case with the RPA and field shunts and GI G2 G3 G4 contactors, motor brake switch and forward and reverse switches. FISH7373 81C NFP
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Post by fish7373 on Feb 2, 2016 22:19:45 GMT
Are those the two boxes between the front door and second-to-front door? I presume those are the traction control resistance grids that are switched out for the speed increase? Are the field weakening resistors also located there? Aidan. HI in the photo you see the side of train is number 1 equipment case with the line brakers and the PBs and the shed box for the overhead trolley lead, the resistance grids are between the center of the frames of the car on the other side of the car is number 2 equipment case with the RPA and field shunts and GI G2 G3 G4 contactors, motor brake switch and forward and reverse switches. FISH7373 81C NFP
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Post by fish7373 on Feb 1, 2016 0:37:10 GMT
Unfortunately I can't upload photos here You can upload photos to, for example, photobucket and then insert them on here. Tutorial. Or, even more straightforward, if you don't fancy that, you can just upload them to, say, flickr and copy and paste a link. Still long winded if haven't got photobucket . FISH7373 81C NFP
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Post by fish7373 on Jan 31, 2016 0:32:52 GMT
They are RPA (rotary pneumatic accelerator) contactors, as you say, traction control contactors and also used for rheo braking. I don't know about D78 but there are about 21 sets of these per motor car on a 73 stock. I've changed hundreds. It's the tips which are changed 2 per contactor forty odd per motor car - a fortune in copper. This is just the RPA never mind the G's, PB's, linebreakers. Sometimes the contactor body including the tips needs to be changed - a pig of a job. Ahhhhhh! retirement is wonderful. HI 1973 RPA is the same D78 and most of the equipment is the same as the 73. and not to bad to change. 1018509 did you work at northfields i still do. FISH7373 81C NFP
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Post by fish7373 on Jan 20, 2016 9:38:39 GMT
HI i will try and keep you updated on this i am not in today i will find out which its paired with FISH7373 81C
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Post by fish7373 on Jan 18, 2016 12:55:00 GMT
Hi def outside door valve cock FISH7373 81C
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Post by fish7373 on Jan 18, 2016 12:48:04 GMT
Hi today unit 111 on set number T334 FISH737381C
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Post by fish7373 on Jan 17, 2016 21:52:11 GMT
Hi we will find out what the black box says on this. FISH7373 81C
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Post by fish7373 on Jan 13, 2016 16:40:02 GMT
HI just to let you know that the new tamper is out on the test track for brake testing tommrow out from northfields depot i have no times for this. And i have some photos on Flickr. FISH7373 81C
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Post by fish7373 on Jan 13, 2016 16:31:18 GMT
Hi are you on the wrong page there 1973 t/stock car numbers fish7373 81c
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Post by fish7373 on Dec 23, 2015 9:22:51 GMT
Yea, essentially the noise I'm referring to is the very low rumbling that gets higher and higher. Occasionally you'll get a bang, an arc flash and the whole train will jolt - ant the noise stops. Would the electrical side have any noticeable effect on noise - ie brushes, brush arcing, magnetostriction? Aidan. I suppose that the brushes and commutators could have an effect as they contact each other. Combined with the gears and vibration of the motor from spinning, you get the noise, but I would suspect that the mechanical interfaces of the DC motor are what separate it from the AC motors and brushless DC DC motors have brushs FISH7373
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Post by fish7373 on Sept 6, 2015 22:41:48 GMT
Yes you can say that 57 is a body snatcher but in the first pictures in the magazine the cab front was of a different design FISH7373
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Post by fish7373 on Sept 6, 2015 14:34:56 GMT
Hi the front still looks like a D78 in the mag FISH7373
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Post by fish7373 on Sept 2, 2015 11:06:57 GMT
HI stock at northfields depot AIT train TRV train and two sets of 1995 T/STOCK FISH7373
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Post by fish7373 on Aug 28, 2015 19:24:10 GMT
The first two sound like the train knew where it was (GPS?) but thought it was travelling in the opposite direction. Possibly the driver had forgotten to reset the destination at turnround? The third one is stranger - it seems to have been counting stations ("dead reckoning" in nautical terms) but miscalculated its starting point. Hi works of the speedo FISH7373
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Post by fish7373 on Aug 26, 2015 15:16:10 GMT
Indeed, most trains are very well presented (externally at least, internally there is far more variation). I guess the train we boarded must just have been overdue a wash for some reason. HI picc wash only at cockfosters depot.FISH7373
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