Another weakness worth the mention, that relates to Bachmann c158. The extra thin wire soldered to each power pickup strips, are easily broken when working on the bogies. It is most fortunate that each bogy has a power strip fitted each side, this enables power take up to continue in the event of one or even two wires severed from the strips.
Resoldering wires is a complete headache, soldering broken wire direct to the strip will certainly cause the plastic to melt from applied heat. Removing the minute screw holding the strip, is certainly most fiddly.
Perhaps someone has mastered a better method to replace the conductor wire to the motor connection.