Carl
Railroader Emeritus (practiced railroading for 46 years--and in 2010 I finally got it right!)
CAACSCOCOM--I don't want to behave improperly, so I just won't behave at all. (SM)
QUOTE: Originally posted by pmsteamman I run Ex GTW GP-9 4545 & 4554 everyday in both freight and passenger service and I am sure they went over 100 many times. Now they are regulated to 10 and 15 in shortline frgt and dinner train service.
QUOTE: Originally posted by CShaveRR There are ways--I don't know how--that the locomotives can be run well in excess of their rated speed. The Grand Trunk Western's passenger GP9s (and 18s) were geared for 83 mph, but I was on a run of the Mohawk in 1970 in which time had to be made up--and we were definitely doing 100 or better with a pair of those (this from milepost timings of 35-36 seconds, noted by three or more people in the vestibules, including myself).
QUOTE: Originally posted by CSSHEGEWISCH Several roads had GP9's with high-speed gearing for passenger service, and those may have spent some time at 80 MPH or possibly a bit faster if they were running late. I would guess that the maximum speeds for each gear ratio are theoretical in part based on the construction and rotational speed of the traction motors. There are probably other considerations that would limit the maximum speed on optimal track.
QUOTE: Originally posted by eolafan I seriously doubt a GP9 was ever operated at 102 mph in any kind of service, or at any speed above around 80 mph for that matter.
QUOTE: Originally posted by malcolmyoung QUOTE: Originally posted by malcolmyoung QUOTE: Originally posted by oscaletrains im doing a scince fair project and i need how fast was a gp9's top speed? This would depend on the gear ratio specified by the railroad when they ordered the loco from EMD. malc. Further to my previous post, EMD would supply the following gear ratios for F7s, so GP9s were probably available with the same choices:- 65/12.....55MPH 62/15.....65MPH 61/16.....71MPH 60/17.....77MPH 59/18.....83MPH 58/19.....89MPH 57/20.....95MPH 56/21.....102MPH The figures refer to the number of teeth on the axle gear (first figure) and the number of teeth on the traction motor pinion (second figure). Malc.
QUOTE: Originally posted by malcolmyoung QUOTE: Originally posted by oscaletrains im doing a scince fair project and i need how fast was a gp9's top speed? This would depend on the gear ratio specified by the railroad when they ordered the loco from EMD. malc.
QUOTE: Originally posted by oscaletrains im doing a scince fair project and i need how fast was a gp9's top speed?
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