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| Re: LIRR East Side Access (256314) | |||
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Re: LIRR East Side Access |
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Posted by WillD on Mon May 22 01:45:27 2006, in response to Re: LIRR East Side Access, posted by ALSTOM R160A on Mon May 22 01:25:17 2006. And thus the reason I have absolutely no faith in anything the morons designing the M8 come up with, they're actually stupid enough to buy into the idea that a second transformer is needed for 11kv 25hz and 12kv 60hz operation. The AEM7s, ALP44s, and ALP46s all have one transformer, and I believe the HHP-8s do as well. The only dual-transformer rail vehicle I can think of is the Acela, which not surprisingly is designed by Bombardier, who probably will end up building these POSes. NJT's Arrows have one transformer which can be switched between 11kv25hz/12kv60hz and 25kv operation in the yard. SEPTA ordered some of their Silverliner IVs with single automatic tap changing transformers capable of handling 11kv 25hz, 12kv 60hz, and 25kv 60hz. There's absolutely no reason for MN to go with two transformers other than laziness on BBD's part. Just design the core for handle 25hz power and have the windings appropriate for 25kv operation, with automatic taps for 12 and 11kv. |
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