Re: super series wheelslip control

[Haggis <wartune@bigpond.net.au>]

Would AC traction be part of the reason too???

bazt wrote:
> 
> An interesting comparison between Super series and normal locos can
> be seen on the Newlands system in North Qld
> This line takes coal from the Newlands and Collinsville mines to the
> port at Abbot Point.
> Prior to November last year the trains were made up of 78 80 tonne
> wagons pulled by 4 2200 hp GE 2600 class locos or a mixture of
> 2600's and 2000 hp Clyde (EMD- GM) locos giving us a theoretical
> 8000 to 8800 hp for a gross max of 6240 or 1650 tonnes per loco.
> In November the 4 GE's and 2170 Clydes per train were replaced with
> 2 3000 hp 4000 class Clydes
> The trains were reduced to 76 80 tonne wagons for a gross of 6080 or
> 3040 tonnes per loco
> On the Collinsville - Briaba section the 4 headers slowed to 21 km
> on the slowest and tightest part and the 17 k section took approx 28
> minutes and if the throttle was reduced to 7 notches to gain
> traction the speed lost would not be regained on the hill
> With the 2 headers the train slows to 17 kph and the section takes
> approx 35 minutes to run the section. If the throttle is reduced,
> any speed lost is regained within 300 meters

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