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Lead Unit Down

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  • Member since
    July 2010
  • From: St. Paul, MN
  • 82 posts
Lead Unit Down
Posted by oarb00 on Friday, November 12, 2010 1:43 PM

I was wondering what happens when the lead unit of a consist goes down. Does it operate like a cab-control unit? Where does it get power for lighting and other functions, from the battery, or does it draw it's power from the trailing units? Also, do the guages in the lead unit operate, such as the ammeter, speedo, and others. How do they monitor the performance of the train in that situation?

Thanx

  • Member since
    December 2004
  • From: WSOR Northern Div.
  • 1,559 posts
Posted by WSOR 3801 on Sunday, November 14, 2010 12:00 AM

When the lead engine fails, it can still function as a control cab.  A couple of the pins in a MU cable transfer power, much power comes form batteries.  The ammeter won't work, but the air gauges and speedo usually work just fine.  Seat of the pants as to how the train is handling.  Might not make it far if the train was underpowered to start with.

Mike WSOR engineer | HO scale since 1988 | Visit our club www.WCGandyDancers.com

  • Member since
    December 2005
  • From: MP 175.1 CN Neenah Sub
  • 4,917 posts
Posted by CNW 6000 on Monday, December 6, 2010 1:26 PM

I'll echo what Mike said.  I have seen that twice on CN and in both cases the train was already a shade underpowered and so was held until the loco could be refuled or refilled with water.  Makes for interesting radio chatter...things like:
-"What do you mean 'you ran out of fuel'?"
-"Well the fuel indicators all say we're out and the engine cranks but won't catch".

Dan

  • Member since
    June 2004
  • From: roundhouse
  • 2,747 posts
Posted by Randy Stahl on Sunday, December 12, 2010 7:42 AM

The heaters don't work either.. its a cold ride in a dead unit .

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