multiple powered locos in one consist?

I haven’t had any trouble with running my locos until I started running my powered Athearn diesels together in one consist. When I run them together, they make a loud clicking sound. And now they make the same click even when run seperatly. Can you help? Any advice would be greatly appriciated.

Sounds like a gear meshing problem - check there’s nothing wedged in the gears and add a little plastics-compatible grease.

I akso think that you should check the gears for anything in them. This problem could have occured wethere you run the locomotives seperatly or together. Maybe you should lightly lube the gears and make sure the motor is sitting properly in the frame.

ShaunCN