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| Answer to Pre-GOH R-46 Questions (320309) | |||
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Answer to Pre-GOH R-46 Questions |
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Posted by Train Dude on Sat Oct 7 08:48:57 2006, in response to Re: Pre-GOH R-46 Questions, posted by SilverFox on Sat Oct 7 02:16:22 2006. The sound that you are referring to came from the 11 KW General Electric converters mounted under the 'A' cars. They had a distinctive 'whine' due to the very large transformers within. The converter would take 600VDC from the 3rd rail, convert it to AC and then back to 37 volts DC to power the train's auxilliary equipment. The pitch of the 'whine' was directly related to the load placed on the converter. When the trains were layed-up, there was virtually no load so the would produce the sound that you described. When a demand was placed on the converters, like if the doors were opened or the lights were turned on, the pitch of the 'whine' would change noticably.This is true of most converters today. Especially as they age and the laminations on the transformer core loosen up, the distinctive sound will get progressively louder. |
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