on Wed Mar 14 15:33:52 2018, in response to Re: [PHOTOS] ***R-10's On The (F) 1980 ***, posted by MainR3664 on Wed Mar 14 06:45:08 2018.
The R-40Ms had a slightly different lighting system from the 42s. The 40Ms like the regular 40s still had the old main light reversing system that had the main light circuit on a timer that reversed the polarity half hourly like the older SMEEs. When the polarity reverser didnít work, the tubes would darken at one end and any employee who noticed it was supposed to operate the main light reverser switch located in the #1 cab (if I recall). The R-42s had an alternator in the light circuit that converted the 600V DC to AC to operate the lights which is why the lights on the R-42s and later cars (as well as the GOHs) didnít go out over 3rd rail gaps.