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I have never used the Cab Control/Legacy/TMCC/ whatever systems of the newer electronics.  From what I understand, there is about an 18volt constant voltage on the track at all times during operation.  The response of the engines on the track is a result of the remote control unit dialing up the chopped waves or whatever to the motors.  My question is, if there is a constant voltage on the track, then do cars like the searchlight, cop and hobo, walking brakeman, and aquarium cars run constantly while on the track?  If they do, then would they be running at full 18 volt speed or is there a way to dial their operation down a few notches via the electronics system?  I am primarily referencing the postwar/mpc/lti cars that use a pickup roller to operate at whatever voltage is on the track with a conventional transformer.  I'm not looking to add resistors, VRMs, or some secret schematic to control the previously mentioned type cars.

I guess you could extend that question as well to the milk car, log and coal dump type cars that use the UCS tracks to operate.  I have found that certain track voltages less that 18v can be dialed up and used to activate the UCS type cars in a more kinder, gentler, more politically correct manner without so much violence.  I must admit to using full voltage as a kid just to see how many rails the milk man could hit on the first can and how many cans he could knock over on the next few cans. 

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You will get better, more technical answers from others. But I will tell you what I do, on a practical level. I have been using a Cab1 to control both a TMCC Command Base and a PowerMaster. I have no experience with Legacy. That said:

I find that lamps in passenger cars act as though they have 18 volts or close to it all the time. Anything else powered from the track would act similarly, I imagine. I often run TMCC locos at 16 or even 14 volts if I am worried about overheating lamps. The engines work fine, though sometimes the electrocouplers do not fire at those voltages.

I use a postwar ZW as a power source, so I can change the maximum voltage just by moving the handle. However, if you use a fixed voltage source, but route the power to your track through a PowerMaster, you can use the Cab1 to turn the track voltage up and down. Then, when you want to use, say, a milk car, you could select the track and dial down the voltage a bit. When you are done, dial the voltage back up to maximum before selecting the engine, and then be on your way.

People will tell you that you should use a TPC instead of the older PowerMaster. I am sure that they are right, but, me, I am just using what I have already  I use breakers and transient voltage suppressors, too, of course.

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