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747400sp
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Electric Brake For Locomotives And Rail Cars

Wed Aug 31, 2011 2:29 am

Even with the warning posted, there are still morons, ( sometime truck drivers who should know better) that like to out run train to the RR crossing, ( I do not see why, the sound and presents of a locomotive scares the heck out of me) and sometime these moron do not make, it and in return comes a tragic ending. I read it a magazine around 2004 or 2005, that said, if trains went to electric brake, the electric brake would stop the train much faster than the air brake trains used now, due to the time it would take the air to get to every car brakes.
So could train companies switch to electric brake?
 
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WarRI1
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RE: Electric Brake For Locomotives And Rail Cars

Wed Aug 31, 2011 2:53 am

I do not know how good an electric brake is, it sounds plausable. The problem is, the Morons who try to beat the train. There is no brake fast enough to defeat a determined Moron.
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sccutler
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RE: Electric Brake For Locomotives And Rail Cars

Wed Aug 31, 2011 3:10 am

The key issue is not application of brakes - that happens quite quickly in trains, with air brakes - the problem is pure physics. Too much mass, inertia, to stop quickly.
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pilotsmoe
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RE: Electric Brake For Locomotives And Rail Cars

Wed Aug 31, 2011 7:24 am

This is already true for most diesel-electric locomotives. They use dynamic breaking in addition to the air brakes.
 
AustrianZRH
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RE: Electric Brake For Locomotives And Rail Cars

Wed Aug 31, 2011 8:00 am

Almost all electric locos over here have both pneumatic and electric brakes, both of them are used in an emergency braking maneuver. However, the morons still get killed as it doesn't make much of a difference at an RR crossing if your braking distance is 1500 yards or 750 yards...
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racko
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RE: Electric Brake For Locomotives And Rail Cars

Wed Aug 31, 2011 9:11 am

Steel-on-Steel wheels make for great efficiency, but for very poor braking.
 
NoWorries
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RE: Electric Brake For Locomotives And Rail Cars

Wed Aug 31, 2011 1:59 pm

JATO rockets pointing forwards would do the trick -- of course then the moron gets fried instead of squished.   
 
YokoTsuno
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RE: Electric Brake For Locomotives And Rail Cars

Wed Aug 31, 2011 5:10 pm

Quoting 747400sp (Thread starter):
So could train companies switch to electric brake?

I think electric braking only make sense for electric trains, or trams. The reason is that the kinetic energy contained in the enormous mass of the train can be fed back to the grid during braking and reused (It is used by other locomotives on the grid as drive energy)

Diesel locomotives are not connected to any grid and the only means of getting rid of the energy generated is convert it to heat. I don't think it really matters if you'd convert it to heat through brake pads, an electric load, retarders or any other means to get rid of the energy.
 
zanl188
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RE: Electric Brake For Locomotives And Rail Cars

Fri Sep 02, 2011 6:43 pm

Is the OP talking about electrically CONTROLLED brakes? I suspect he is...

The advantage to electrically controlled brakes is they can alter in which sequence the brakes come on. All at once, back to front, front to back, every other car, etc. As opposed to current pneumatic brakes which only come on front to back (unless the train line parts, in which case the brakes come on at the point of the break and go to the front or back from there)
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EDICHC
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RE: Electric Brake For Locomotives And Rail Cars

Sat Sep 03, 2011 4:22 am

Quoting YokoTsuno (Reply 7):
I think electric braking only make sense for electric trains, or trams. The reason is that the kinetic energy contained in the enormous mass of the train can be fed back to the grid during braking and reused (It is used by other locomotives on the grid as drive energy)

There are two types of electric braking, rheostatic where the energy is dissipated as heat and regenerative which returns power to the supply. basically in regenerative braking the locomotive or elecrtric multiple unit's traction motors effectively become dynamos generating current. In rheostaitic braking the traction motors generate current but heat is released through cooling coils, somewhat akin to an electric heater.
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wukka
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RE: Electric Brake For Locomotives And Rail Cars

Sat Sep 03, 2011 10:05 am

Perhaps on passenger trains, which are relatively short and contain power generation. Freight, not so much. Retrofitting the cargo fleet with electric braking would not only be cost prohibitive, but with the advent of distributed locomotion as well as dynamic braking, unnecessary.
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