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[quote]QUOTE: Originally posted by AlvieCO Hi all, I was at a friends house one day and he had a brass model that had something called "Coasting Drive" as I understand it, coasting drive allows a locomotive's driving wheels to roll freely without any power on the tracks. Really cool! But, I'm wondering, how does this "Coasting Drive" actually work? is it part of a special motor, gearbox etc? And last, but not least, is it something one can add to other models relatively easily? Thanks, Alvie. [/quote] If you are talking about the Key engines with the coasting drive, I can tell you some things about those. I have several with the coasting drive, but it is a mechanical design in the gear box that allows the worm to move away from the gear. I can pu***he engine back and forth on the track without power and it will disengage the worm and allow you to move it like a non-powered model. When you operate on a layout, you have to be advised that if you stop and the worm disengages, the whole train will roll downhill. I have not idea if you can purchase it from Key, but you could certainly ask them if they sell the gear box. I believe that is the only one they use since they started with the coasting drive back in 1986 or so. I like it for the home use, but I do not use them on a club layout because of the possible runaway situation. If you stop and keep power on the unit, they usually do not disengage, but you can have a problem on a downhill run holding back the train if it does disengage. The main advantage is they tend to run great!
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