|
|
| Re: The LIRR President Speaks (244540) | |||
 |
|||
| Home > SubChat | |||
|
[ Read Responses | Post a New Response | Return to the Index ] |
|
||
|
Re: The LIRR President Speaks |
|
|
Posted by WillD on Sat Apr 22 22:57:27 2006, in response to Re: The LIRR President Speaks, posted by Dutchrailnut on Sat Apr 22 19:08:23 2006. If you think for a moment that a M-7 with 1000 hp per car and AC propulsion uses more electricity than a M-3 with DC propulsion and everything wasted through Grid resistors at 660 hp per car your sadly mistaken.Where have I said the M1s or M3s were superior to the M7s? If I gave you that impression I apologize, but I have no problems with the AC traction equipment, the lack of an RFW, or any of the other arguments you apologists for bad railcar design have put in my mouth. I have nothing against the concept of the M7s, even though their purchase would appear to be premature, but I have everything against their execution. If the M7, despite weighing almost 35,000lbs more than the M1, is capable of greater efficiency then just imagine what a lighter weight EMU would have been capable of. SEPTA specified an AC EMU with a weight equal to that of the M7, and Kawasaki, Rotem, Bombardier and Siemens all thought it was possible to build such a vehicle. Chop the 20-30,000lb transformer off the bottom of that thing and you have a 95 to 105,000lb EMU which would actually do something about lowering MN and LIRR's power bills. You claim destruction of track structure by M-7's ??? cool wonder how 298 000 lbs Genesis units and simular DE/DM's don't destruct track ?? Where did I claim destruction of track? I said that the NY Taxpayers would spend millions on power, not on track repairs. Unlike yourselff I try to stick to stuff that I have some inkling about, and the interface of railcar and track is something I know very little bit about at the moment. I do know that Force equals Mass times Acceleration, and that Energy equals Force times displacement, so that by using the same acceleration rates with the same electrical system a lighter weight EMU will save on energy when compared to a heavier EMU over a given distance. |
|
|
|