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Old 6th July 2007, 14:30
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LesG LesG is offline  
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Join Date: May 2007
Location: Keith, NE Scotland
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Quote:
Originally Posted by wessexrailwaysdude View Post
locomotives working in multiple are down to the connectors linking each locomotive not the coupling of the trains.

so if a class 60 was attached to a class 66 they wouldn't be able to work in multiple, one of the locomotives would be "dead" or running idle if the engine was running.

Class 59's Class 66's and class 67's can work together in powering trains as they use a system called AAR or something like that its called.

But going back to speed restrictions. The class 66 differs from the class 59 in the sense that the wheels follow the curvature of the track as the end wheels of each boogie are self steering thus preventing rail wear so would be interesting to know if there is a difference for class 66 on speed restictions if it goes on wear and tear on some things.

Plus class 59's (not sure about the 59'2's tho) have some sort of computer control thing that controls the amount of wheel slip on the rail...allowing the wheels to slip by a certain amount on pulling away from a heavy start but the amount they are allowed to slip by is small.

but would be interesting to know if things like that affect speed restrictions on loco's.

The simple answer is NO to the different class of loco on speed restrictions, a differential speed restriction applies to the class of train not the loco.

As for the 59/2, Yes they have a system on them called creep control this basically works similar to the 66/67 in that when the computer detects the wheel starting to slip (not slide) then the system will automatically start to apply sand to the rails, this is what you see when a 59/66 or a 67 is pulling away and you see a dust trail from the leading bogie. The system will cut out in normal conditions at about 10mph unless the computer detects poor rail conditions by continuos wheel slip.
In the case of a train sliding then the sand has to be applied manually by the conrol lever in the cab by the driver.

To explain slid/slip, Wheel slip occurs under power when pulling away etc and wheel slide occurs usually under braking conditions.

Hope this clears a few thing up.

Les
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