31 views and no help

I'm lost there appears to be adaptors to convert a 21 pin to an eight, do any of you know which would be best for this Bachmann class 20 deisel?

I've just purchased this loco from Rails Of Sheffield, it takes a 21 pin decoder, can I use any decoder, been looking at one from Hattons, that looks a good price.

Yeah have just tried it on the second radius with no problems, I usually run my passengers on the second radius and my goods on the other, so I was perceiving with it, thought it would be okay, but it looks like it will have to be the second radius  from now on.

First radius it's on a 6ft x4ft board

This loco on a circular track one of the wheels usually jumps the track, it can be any of the wheels, I also have a set of points that it derails every time it passes over, I have three other Bachmann and three Hornby locos, that pass over these points with no problems, thinking of sending it to Bachmann to see if it can be fixed,
I am a club member and a couple of experienced members have looked at the points and said they are okay.
Any ideas what could be causing this loco being a serial derailer?