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Discussion Starter #41
I tooked the 492 shell off and looked at the date i was wrong it is april of 1958 the 490 is clear as day. I have jewelers light with a big magnifine glass. Does the speaker sound always on when it running i thought you had to have the button part. Thanks

Al
 

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The 492 is equipped with both the Diesel Horn feature and the Diesel Roar feature. The horn requires a special control box plus a rewiring of the power connections to the track. You are hearing the Diesel Roar which is always on, it simulates the sound of a diesel engine. There should be an on-off switch for it on the chassis.
For info, engines with the Diesel Horn can only be run with transformers that output a pure sine wave, such as original Gilbert or Lionel transformers. If a modern transformer is used the Diesel Horn will sound continuously because of the harmonics in the output power to the track.
 

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If you want to stop the diesel roar just unsolder the black wire coming from the vibrator where it connects to the speaker terminal.
 
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