Can you mue 100 locomotives?

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Can you mue 100 locomotives?

Postby Trainman101 » Thu Jan 25, 2018 9:52 pm

Is there a limit of how many con work together? Thanks
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Re: Can you mue 100 locomotives?

Postby DutchRailnut » Fri Jan 26, 2018 8:46 am

no the amount of control relays activated would trip the Control circuit breakers on lead unit.
8 is about the most before problems start.

add to that that most railroads have rules on how many active traction motors in a consist, on most railroads its limited at 24.
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Re: Can you mue 100 locomotives?

Postby Allen Hazen » Sat Jan 27, 2018 1:45 am

Couple of questions.
The Pennsylvania Railroad, to balance power at different terminals, used to run whole trains of locomotives (no cars). Would most of these have been dead-in-tow rather than m.u.'ed?

And the Chicago Great Western, I think, was noted for running long freight trains with massive numbers of F-units: I think I have seen reference to their using up to ten units on one train. 10>8, so… does anyone know if they did something special to allow reliable m.u. operation of locomotive consists of this size.

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Re: Can you mue 100 locomotives?

Postby DutchRailnut » Sat Jan 27, 2018 8:53 am

they probably only MUed the air , no jumper to rest of consist.
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Re: Can you mue 100 locomotives?

Postby BR&P » Wed Jan 31, 2018 9:57 am

DutchRailnut wrote:they probably only MUed the air , no jumper to rest of consist.


I presume he is talking about the PRR part of your question. If the CGW was using 10 units to pull the train, they would all be fully MU'd. I don't know whether they did anything special or not. I suspect they just set them up and crossed their fingers.

The PRR also may have towed along the trailing units at idle, especially in winter when you would not want the engines dead account freeze-up.
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Re: Can you mue 100 locomotives?

Postby John_Perkowski » Wed Jan 31, 2018 5:11 pm

Is there not now a FRA limit on the number of powered axles for a consist?
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Re: Can you mue 100 locomotives?

Postby DutchRailnut » Wed Jan 31, 2018 6:43 pm

no, just individual railroad rules. most limit it to 24
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Re: Can you mue 100 locomotives?

Postby mtuandrew » Sat Feb 03, 2018 1:41 pm

Allen Hazen wrote:And the Chicago Great Western, I think, was noted for running long freight trains with massive numbers of F-units: I think I have seen reference to their using up to ten units on one train. 10>8, so… does anyone know if they did something special to allow reliable m.u. operation of locomotive consists of this size.

I think in regards to the CGW, if there were ten units on some trains, at least a few of those ten would have been manned helpers for the grades out of Dubuque & the Winston Tunnel. I haven’t seen pictures of that many units MU’d together in operation (I can’t imagine how many drawbars they would have broken with more than 8 units/12,000 hp fighting 200 cars on the rolling CGW route profiles), though Don Hofsommer or John Luecke would be much more definitive references.
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