Thanks for the advice. The locos haven't been on a rug or carpet but will work through the other suggestions.

Many thanks.

Rowenjosh

Thanks for the reply.
Both locos have previously run very well.
Both are N Scale, neither is DCC.
They run on DC layouts.
Other locos run on the same layouts without problem.
Thank you again.

I am new to the forum.
We have a Spectrum Mallet and a J Class 4-8-4, both run on different layouts and now both present the same problem.
When we apply power, the front light shines but the locos will not move. The wires between the tender and rear of the cab on the J Class have lost their black paint, but that is the only thing I can see which might be the problem.

Any help greatly appreciated.