DC or AC electrical question.

And I also run my trains on DC current be they postwar or modern. I have been slowly stripping the circuit board reverse units out of my DC can motored truck mounted engines.

I'm not the only one who has notice these dual motored DC truck mounted types of locos tend to be very noisey especially on tight 027 curves. No doubt some of this is due to just 2 differing motors are not going to run at the same exact speed. Some of this is also due to the traction tire arrangement: having the traction tires on the opposite wheel sides of the same axle is a no-no.

But in addtion I have found that running these can motored locos minus circuit boards, they run noticable smoother and more quietly. Speed is also more consistant.

I use off board sound, so there is no obother there. And I did have to adjust voltage levels of on-track lights to lower voltage bulbs but that was no bother either.

I have no problems with mechanical e-units nor any problems with any of the factory made operating cars I have. My own operating cars were designed and built by me with DC operation in mind.