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I guess this section is ok for my discussion which seems like an electrical issue with my 072 mth realtrax  switch. I have 16 other mth switches on the layout all wired the same and I only have a problem with one the (17th). I have two 072's on the same line almost back to back but separated with a 4in piece of mth track. One RH and one LH switch. I might also add that these MTH switches are all incorporated into a tubular track layout, and I used the 4" conversion track on the ends of the switches, all except these two where an mth piece is in between both switches. I am not sure of what the problem may be. I have power at the control, the light lamp does come on at the switch, but when I flip the control switch either way, the switch just racquets or makes buzzing noise and will not throw. I did speak with an MTH service guy and he suggested to check the switch end of the track at the ' V ' to make sure the track was not touching a nearby piece. I cannot see anywhere on the surface of the switch where contact might be happening. Could there be something on the bottom side of the switch? My last thing to try would be to rewire the switch from track side to control box. but I seriously doubt that could be a problem because it does seem like power is there.  Any troubleshooting tips would be helpful. Thanks Dan

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It sounds like the anti derail is keeping it thrown one way.

This is caused by a connection between the outer rails of the track connected to that direction exit. I have had this fault when track was not level and the track rails tipped against the Switch rails.

Try disconnecting the track from the end it wants to send the train on and see if the problem goes away.

If it does, you have a short there. Normal tubular track is always connected between the outer rails. Insulate the end of the rail on the inside of the V created by the departing tracks.

Be sure it doesn't contact the rail at the end of the switch, you need a tiny gap there. I have used a bit of insulating electrical tape across the rail end. A fiber pin will force spacing if you clip off the end that would go inside the switch, leaving the bulge holding the rails gapped.

Russell! Thanks for the tip. I ended up with an insulated pin in that outside rail and bingo.......the switch now works. Thanks again.
Dan
 
Originally Posted by Russell:

It sounds like the anti derail is keeping it thrown one way.

This is caused by a connection between the outer rails of the track connected to that direction exit. I have had this fault when track was not level and the track rails tipped against the Switch rails.

Try disconnecting the track from the end it wants to send the train on and see if the problem goes away.

If it does, you have a short there. Normal tubular track is always connected between the outer rails. Insulate the end of the rail on the inside of the V created by the departing tracks.

Be sure it doesn't contact the rail at the end of the switch, you need a tiny gap there. I have used a bit of insulating electrical tape across the rail end. A fiber pin will force spacing if you clip off the end that would go inside the switch, leaving the bulge holding the rails gapped.

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