What makes the zapping noise on diesel electric locomotives?

Question:
When I see diesel locos moving slowly or idling, I often hear an electrical zapping sound coming from it. Is it from the traction motors?

Answers:

I plant to travel from San Antonio to DC by train?

railrunner is on the right track (no pun intended).

I work on the railway so I know what the following terms mean but?

The main air reservoir has air operated, automatic condensation releases for getting rid of the unwanted moisture that collects in the reservoir.

How do the U.S railroad companies manage their freight wagons?

The condensation is created when the air that comes from the air compressor, which is hot, travels through the after-cooler on its way to the main air reservoir. As the air cools, condensation occurs and the result is water.

is there a restroom in a locomotive? i know UP workers work long hours...so i was wondering?

Most describe it as a "popping" sound, but zapping plays just as well.

weyauwega train wreck?

Good question.

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trains shedule who goes to gwaliar from new delhi junction?

What you are most liking hearing is air from the air compressers that will make a loud like zapping sound.Traction motors don"t make any noise when siting at a idle.

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On American trains, were there ever Amber Lenses on marker lights? and when did Marker Lights stop being used?

In the UK it used to happen in the days of steam locomotives as well, if the loco had a Westinghouse brake system. That used a reservoir on the side of the loco which made a 'popping' noise whilst the loco was idle.

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Why did steam locomotives in the UK not have a light on the front of the engine?

Hoghead gave another great answer.... Air needs to be as dry as possible in order to extend the life of air brake equipment...Along with automatic drains most locomotives have air dryers which remove most of the moisture in the air system...

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In terms of mechanical efficiency, is it more efficient for a freight train to push it's cars or pull them?

hoghead is exactly right!

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