> This leads to various differant HP ratings that can be delivered to the
> traction motor sets at differant speeds and for differing times.
> Ideally it would be nice to be able to increase the number of traction motors
> from the usual 6 to 8 as engine HP increases,but loading and curve radii
> prevent this.
A couple of observations I'd like to share. We ran a 105 wagon coal train from
Kooragang Island to Ulan and return. On the return, we did a test lift on
Whittingham Bank with three 90 class locos and 11670 tonnes hanging off the
back. At 0.5 km/h, the locomotives were exerting about 300 horsepower at 1900
Amps. At 2 km/h, the locomotives were exerting about 900 horsepower at 1800
Amps. At 25 km/h, the locomotives were exerting about 3830 horsepower at 900
Amps.
> This can mean that a 4000 HP loco cant start a heavier train than can a 3000
> HP loco with the same number of traction motors.
>
> cheers
> Maurie Daly.
-- David Johnson - Rail Services Authority trainman@ozemail.com.au trainman@railpage.org.au http://www.ozemail.com.au/~trainman