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TwinCitiesRailfan.com :: View topic - Determining Power for a consist.
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Determining Power for a consist.
http://twincitiesrailfan.com/forums/viewtopic.php?f=35&t=627		 Page 1 of 1
Author:  EMDSwitcher [ Tue Nov 28, 2006 1:23 pm ]
Post subject:  Determining Power for a consist.
How do the railroads figure the amount of power for a trip. Is it based on tonnage? This is the only transport industry I can think of that has multiple choices for power.
Author:  MilwaukeeroadMatt [ Tue Nov 28, 2006 2:15 pm ]
Post subject: 
Tonnage plays a big part but, but not in the way you would think. The heavier a train is the more braking power it will need to stop. Two C44-9W' could move say a 7500 ft, 8900 pound train with no problem but there stoping braking effort depending on grade, speed and other factors my mean the need for additional units in the consist to cover the braking needs.
Author:  EMDSwitcher [ Tue Nov 28, 2006 5:43 pm ]
Post subject: 
Do they add extra engines to generate more air pressure for the brake cylinders? Its seems adding engines would greatly increase the weight of the consist.
Author:  ottergoose [ Tue Nov 28, 2006 6:09 pm ]
Post subject: 
Remember (or find out now), that the air brakes on a train turn on (e.g. start slowing down) when the air pressure goes out - that way they're fail safe. If, for example, a coupler broke in the middle of a train, the section that broke away would stop by itself, as the air pressure would go away. In other words, air goes out, brakes go on.

Any extra locomotives added to assist with braking would be for the dynamic braking, not air pressure.

I'm pretty sure that's correct... feel free to correct me :)
Author:  MilwaukeeroadMatt [ Tue Nov 28, 2006 7:56 pm ]
Post subject: 
Could not have said it better.
Author:  brahamfireman [ Tue Nov 28, 2006 8:31 pm ]
Post subject: 
Author:  EMDSwitcher [ Tue Nov 28, 2006 9:25 pm ]
Post subject: 
Author:  brahamfireman [ Tue Nov 28, 2006 9:43 pm ]
Post subject: 
Author:  EMDSwitcher [ Mon Dec 04, 2006 1:32 am ]
Post subject: 
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