Hi Earl
Have you checked that all the loco's wheels are spotlessly clean and that the rails are nice and clean too?
Other than these basic checks I'm sorry I can't help with Zero 1 really as its to old now.
As you have just 7 locos fitted with Zero 1 decoders perhaps its time to consider changing to DCC and replacing the decoders with modern DCC ones (Zero 1 wont work on todays DCC systems) and buying a modern DCC control system?
Don't forget that Zero 1 spares are now really hard to obtain and there's no manufactures back up either.
If you haven't researched DCC I would suggest you look at some of the basic systems being marketed by Hornby, Bachmann and perhaps NCE.
Edited to add... You can fairly easily convert back to DC but best to stick with modern DCC!
Have you checked that all the loco's wheels are spotlessly clean and that the rails are nice and clean too?
Other than these basic checks I'm sorry I can't help with Zero 1 really as its to old now.
As you have just 7 locos fitted with Zero 1 decoders perhaps its time to consider changing to DCC and replacing the decoders with modern DCC ones (Zero 1 wont work on todays DCC systems) and buying a modern DCC control system?
Don't forget that Zero 1 spares are now really hard to obtain and there's no manufactures back up either.
If you haven't researched DCC I would suggest you look at some of the basic systems being marketed by Hornby, Bachmann and perhaps NCE.
Edited to add... You can fairly easily convert back to DC but best to stick with modern DCC!