[Jeff T]

Small one anyway... On O36 track the car behind it keeps derailing. I assume the answer is a die cast car or at least something with more weight to it?

Thanks!

 

[seayakbill]

Or possibly a greater swing of the coupler assembly. Some of the modern freight cars have couplers that will swing from edge to edge of the freight car.

The Weaver scale RS-3 was terrible, the coupler hardly would move from side to side without cutting a larger hole in the cowl.

Bill

 

[BillTrzaskus]

If it's the legacy S-2, they were made with body mounted couplers. I have one in CNW. Look onthe box label for the minimum curve requirement. Might not be enough swing for such a tight radius. Adding weight to the freight car won't help as the engine is literally pushing the car towards the outer rail.

 

[Jeff T]

From the Lionel website - Min Curve: O-31

I'll add some weight and see if it loosens up...

 

[T-Man]

Check wires for slack too!

 

[Krieglok]

Does the engine derail? Or just the car?

Tom

 

[Jeff T]

Just the car. Very lightweight all plastic...

 

[gunrunnerjohn]

Look at the centering spring, sometimes the coupler doesn't want to move cleanly in one or both directions. If there's any force in moving it to the side, it'll pull a light car off the rails. The cure is either free up the coupler or use a heavier car for right behind the engine.