Trivia question: on what locomotive was the GE model 785 traction motor used? (785PA2, to be precise.) Does it help to be told that the traction generator (well, alternator) was a GTA-17 (GTA-17PF1 to be precise)?
These model designations are from the description of the locomotive at
http://www.viarail.ca/en/about-via-rail ... comotive-1" onclick="window.open(this.href);return false;
(apparently an ad trying to sell off retired units: I have no idea whether the locomotives are still available for sale, or whether VIS's webmaster just forgot to take the ad down.) Right: the MLW LRC passenger locomotive.
So, what are these bits of electrical equipment. The generator is probably a Canada-only variant (or maybe a designed-to-be- mated-with-a-251-engine-in-an-MLW-locomotive variant) of the GTA-11: the M-420 road switcher also (according to the technical details page at thedieselshop.us) also had a GTA-17 generator.
(I wondered if maybe it was a variant of the GTA-11 with a connection for an HEP generator, as on the U34CH, but no: the U34CH's generator was a GTA-16.)
But what is the 785 traction motor? First guess: basically a 752 with a non-standard gear ratio for a high-speed unit. Second guess: a seriously different, probably lighter weight, motor designed specially for the LRC project. (Note that GE has, on occasion, provided lighter motors than the 752 for units where weight was critical: the Australian NR class, a cousin of the
C40-8 built for use on Australia's more lightly built track, has a lighter, less powerful, motor than the 752.) Third guess:the Canadian branch of GE had a little bit of independence from the parent company when it came to assigning model designations.
But if anyone actually KNOWS, I'd be curious to hear just how different a 785 was from a 752. (Note that the E60 passenger electrics built for Amtrak also had traction motors that had some number other than 752. But I don't think it was 785.)
These model designations are from the description of the locomotive at
http://www.viarail.ca/en/about-via-rail ... comotive-1" onclick="window.open(this.href);return false;
(apparently an ad trying to sell off retired units: I have no idea whether the locomotives are still available for sale, or whether VIS's webmaster just forgot to take the ad down.) Right: the MLW LRC passenger locomotive.
So, what are these bits of electrical equipment. The generator is probably a Canada-only variant (or maybe a designed-to-be- mated-with-a-251-engine-in-an-MLW-locomotive variant) of the GTA-11: the M-420 road switcher also (according to the technical details page at thedieselshop.us) also had a GTA-17 generator.
(I wondered if maybe it was a variant of the GTA-11 with a connection for an HEP generator, as on the U34CH, but no: the U34CH's generator was a GTA-16.)
But what is the 785 traction motor? First guess: basically a 752 with a non-standard gear ratio for a high-speed unit. Second guess: a seriously different, probably lighter weight, motor designed specially for the LRC project. (Note that GE has, on occasion, provided lighter motors than the 752 for units where weight was critical: the Australian NR class, a cousin of the
C40-8 built for use on Australia's more lightly built track, has a lighter, less powerful, motor than the 752.) Third guess:the Canadian branch of GE had a little bit of independence from the parent company when it came to assigning model designations.
But if anyone actually KNOWS, I'd be curious to hear just how different a 785 was from a 752. (Note that the E60 passenger electrics built for Amtrak also had traction motors that had some number other than 752. But I don't think it was 785.)