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Resistance Formula Diesel/Electric loco dead in tow

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Sean Emmett

Posts: 141
Resistance Formula Diesel/Electric loco dead in tow - Posted: August 31, 2017 - 9:55 PM Quote and reply
I travelled on the Easterling on Bank Holiday Monday from Kings Cross to Great Yarmouth and return behind 60163 Tornado with 13 Mk1s and 66 128 dead in tow at the rear. By that I mean it was completely shut down.

I made that 601 tons tare and 630 - 635 tons gross.

Tornado achieved a constant 46 mph on the 1:200 between Wood Green Tunnel South and Potters Bar Tunnel North, before easing for the pick-up.

I would like to know what formula I should use for the rolling resistance of a diesel (or electric) loco dead in tow, and any variations between class?

Maybe something we could add to the RPS horsepower calculation?

The more vexed question is the resistance (or otherwise) of a class 47 in notch 1 when attached to the rear of a steam special...

Would very much welcome feedback.





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Hartill

Posts: 42
Re: Resistance Formula Diesel/Electric loco dead in tow - Posted: October 1, 2017 - 10:43 AM Quote and reply
Sean Emmett said:
I travelled on the Easterling on Bank Holiday Monday from Kings Cross to Great Yarmouth and return behind 60163 Tornado with 13 Mk1s and 66 128 dead in tow at the rear. By that I mean it was completely shut down.

I made that 601 tons tare and 630 - 635 tons gross.

Tornado achieved a constant 46 mph on the 1:200 between Wood Green Tunnel South and Potters Bar Tunnel North, before easing for the pick-up.

I would like to know what formula I should use for the rolling resistance of a diesel (or electric) loco dead in tow, and any variations between class?

Maybe something we could add to the RPS horsepower calculation?

The more vexed question is the resistance (or otherwise) of a class 47 in notch 1 when attached to the rear of a steam special...

Would very much welcome feedback.





I have always found this a difficult one, I have had a few runs where there is a dead loco as part of the train. I would assume a loco will have more rolling resistance than a coach, for examole the traction motors will be turning how ever as a loco weight is is the equivalent of 2.5/4 coached depending on the coaches and the engine I would ask the question does one loco have more or less resistance than for the sake of the argument 3 coaches.

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