Many years ago, I was told not to leave a locomotive powered up in the "neutral" position for any length of time. For some reason that has stuck with me, and I still do not do so.
So, here's my question, with older postwar and MPC E-unit equipped locomotives, is there any harm leaving them in the "neutral" position for extended periods of time while I operate newer TMCC equipped engines on the same circuit? 
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I’m not a post war guy but seems to me that it’s no different than while running. E unit is engaged either way.
If you are running TMCC there is 18 volts on the track over a long period of time. This can burn out smoke units. Some MPC e-units also have a loud buzzing in neutral. I have installed switches to turn off the smoke and e-units. Plastic smoke units can do a complete melt down. Don't ask me how I know.
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