gideonr:
haven't most of them been changed to alternators?
In many of the "Early to Mid Era 1st Generation" Locomotives, made by EMD and General Electric, the Prime Mover was driving a DC Generator.
Around the late 1960's - with production of the "Later End of the 1st Generation" Locomotives, the makers began selling Locomotives with 3 Phase AC Alternators as an option, and by the early 1970's, 3 Phase AC Alternators became standard equipment*¹.
On the EMD / General Motors side, production of Locomotives with the "567 Series" Prime Mover (Diesel Engine) were normally coupled to DC Generators.
As the "645 Series" Prime Movers took over in 1966, they started to be coupled to 3 Phase AC Alternators more and more.
By the time the "710 Series" Prime Movers took over, they were All*¹ coupled to 3 Phase AC Alternators.
*¹EMD's Yard Switchers still came standard with DC Main Generators. These cover the Models' ranging from the early TR-6 "Cow And Calf", through the SW-8, SW-1200, SW-1500 and the MP-1500BTW: The EMD Prime Movers have always been produced by General Motors. The first one was the "Winton Model 201-A", which had a Bore and Stroke of 8" x 10".
The Model 201-A was succeeded in late 1938 by the "567 Series", which is a 2 Stroke Prime Mover, with a Bore and Stroke of 8½" x 10"
(567 In³ per cylinder).
The 567 was succeeded in 1966 by the "645 Series", which is also a 2 Stroker, but with a Bore and Stroke of 9 1/16" x 10"
(645 In³ per cylinder).
Around 1984, the 645 was succeeded by the "710 Series", which was the last of the normal production 2 Stroke Diesel Prime Movers from GMDD / Detroit Diesel.
It's Bore and Stroke were 9 1/16" x 11"
(710 In³ per cylinder).
I believe the 710G might be a 4 Stroker, but not sure.
The newer Model Passenger Locomotive - the "F59PHI" has, what sounds like, a 4 Stroke "Main" Prime Mover, along with a 4 Stroke Auxiliary / HEP Prime Mover.
The F59PH and F59PHI use the 710G Series Prime Mover, for the "Main" Prime Mover.
To my knowledge of the newest Prime Movers being developed by GM / EMD, the "265 Series" is the current one.
This is a 4 Stroke Prime Mover with A Bore and Stroke of 10.4" x 11.8"
(1002 In³ per cylinder)
I kind of went off the topic regarding Main Gennys, with the Prime Mover stats, but I thought this might be of interest.
Let me know if anyone wants some information regarding Main Generators used by EMD or GE, or any other Locomotive related information
Scott35
