Just bought 2 off worm & worm wheels hoping to replace worn gear on axle , along with that l bought 2 off 0-6-0 motor and retainers (which l thought were amazingly cheap at just under £3) these have come with a 4 point plug attached . Original Thomas 0-6-0 doesn't have this plug (black lead ,grey lead, red lead ,pink lead) l assume l will be able to remove solder join some of these leads to get chassis working on track , have put power to motor and am happy that it operates as it should ,it's just that on track this plug is coming into operation and chassis is static , l probably would be able to work it out , but thought it more appropriate to get answers on here? Which leads need joining to which ? Thanks for any answers