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  • Member since
    March 2013
  • 559 posts
Posted by BigAl 956 on Wednesday, December 13, 2023 10:26 AM

O27 switches are notorious for developing dead spots. Use a test lamp or meter to check if there is an interuption of the center rail power.

  • Member since
    December 2005
  • From: Hopewell, NY
  • 3,215 posts
Posted by ADCX Rob on Saturday, December 9, 2023 8:32 AM

What is the catalog number of the locomotive?

Are you using 1122 switches, or the more common 1122(E) switches?

Are the switches arranged in a way that creates an "Ess" S curve?

Post pics of everything, including the track arrangement.


  • Member since
    January 2009
  • 1,980 posts
Posted by 8ntruck on Thursday, December 7, 2023 7:16 PM

Do the switches make all of your locos reverse, or just a particular one?  If it is just one loco, what is it?  Does it matter which direction you are entering the switches when this happens?

Generally, locomotives reverse because of a momentary loss of power.

Working from memory, the 1122 switches have an anti derailing feature that is triggered by the wheels of a loco or a car across an insulated rail.  The insulated rails are usually the short ones jist past the points.  It is possible that something here might be causing your issue.

Good luck and enjoy your railroad.

  • Member since
    December 2023
  • 1 posts
Posted by jww on Thursday, December 7, 2023 10:10 AM

I have a layout that use 1122 switches back to back.  When I run the train through one of the conmected switches, it cause the locomotive to reverse. This is a O27 layout.  Any though?

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