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Run Away Consist

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G8B4Life:
Do any other RP equipped loco's do this when MU'ing in the helix? Do any of the F7's display this behavior singularly? as a pair? when going downgrade? While I don't doubt that the load sharing might not work as well downgrade as it does on the level and upgrade I've not heard of anyone reporting this before and I'm confident that others have run MU's downgrade as well so it would be good to eliminate all those variables.

- Tim

Josephbw:
It sounds to me like a gear lash problem. As you go downhill the play in the gears will allow the engine to surge forward, then the lash is taken up. and it slows down. On a long downhill run, this will take place multiple times. The cure might be shims behind the brass gear in the trucks.

Joe

William Brillinger:
"It sounds to me like a gear lash problem."

I was thinking the same thing.

SCL1923:

--- Quote from: G8B4Life on November 27, 2021, 09:15:37 PM ---Do any other RP equipped loco's do this when MU'ing in the helix? Do any of the F7's display this behavior singularly? as a pair? when going downgrade? While I don't doubt that the load sharing might not work as well downgrade as it does on the level and upgrade I've not heard of anyone reporting this before and I'm confident that others have run MU's downgrade as well so it would be good to eliminate all those variables.

- Tim

--- End quote ---
Thanks Tim, I have 2 sets of 4 F7's MUed that DO display this occurrence and one pair of SDP40F's MUed with 12 coaches that DO NOT display this problem. And a couple of singularly run steam loco's that Do Not display this occurrence.
This morning I tested a single loco with 12 passenger coaches with no occurrences. Adding a second loco however, DOES display this problem. Also got out my inclinometer and measured the gradient of basically 2%.

ON28:

--- Quote from: William Brillinger on November 28, 2021, 01:32:09 PM ---"It sounds to me like a gear lash problem."

I was thinking the same thing.

--- End quote ---

Also called cogging.

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