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Post by Christopher J on Aug 6, 2006 22:35:48 GMT
Because the D78 Stock and 1973 Tube Stock car wheels and motor bogies are interchangeable, do swaps of the bogies and other equipment between the two fleet happen at all? (if ever?)
I think I remember reading that there used to be a D78 equipped with 73TS brake release valves, not sure if the D78 in question still retains them however.
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towerman
My status is now now widower
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Post by towerman on Aug 6, 2006 23:33:16 GMT
Don't know if it's still valid as D stock had all their trucks replaced a few years back,mind you,the wheels are still the same.
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Deleted
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Post by Deleted on Aug 6, 2006 23:41:38 GMT
Yeah, the original bogies were too rigid and cracked due to stresses induced by the poor-quality District track.
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Ben
fotopic... whats that?
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Post by Ben on Aug 7, 2006 7:01:38 GMT
So does the pic still have them?
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Post by trainopd78 on Aug 7, 2006 9:06:49 GMT
I always thought 73ts had traditional bogies where D stock has H frame bogies??  The motors and wheels were interchangable though. |
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Deleted
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Post by Deleted on Aug 7, 2006 17:13:02 GMT
I always thought 73ts had traditional bogies where D stock has H frame bogies?? The motors and wheels were interchangable though. I thought that was the case too. The bogies for both trains are totally different..... |
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towerman
My status is now now widower
Posts: 2,879
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Post by towerman on Aug 7, 2006 19:44:44 GMT
Yes,remembered that today,wheels and motors on 73TS & D stock were interchangable.67,72 & 73TS had the same type of truck.D stock & 83 TS had same type of truck.
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Post by trainopd78 on Aug 12, 2006 10:20:06 GMT
As delivered, the D stock and 83ts had rigid "H" frame trucks but these suffered cracking from their rigidity and our jointed track, so had to be constantly welded up to keep their strength.
Today, the D stock has 2 "T shaped half trucks joined together with dampers to form a H shaped truck so there is now flexibilty in the truck to overcome the problem of the frame cracking. I believe this design is based on the trucks fitted to the 95ts.
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Post by stanmorek on Aug 13, 2006 9:29:38 GMT
I'd think that any welds found to be cracked would have to be grinded out and rewelded. Welding applies a lot of heat to the surrounding steel and repeated welding could embrittle the joint or warping. Also there can be micro cracks in the weld which could fail in fatigue which might need a much lower load than the weld is actually designed for to crack it.
Welded assemblies which undergo dynamic loads would need to be a high quality weld with expensive after testing. LU prefer to avoid welding (especially site welding) to primary members on underbridges.
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