Is this the only page you have? A lot of schematics like that have at least one page devoted to abbreviations and the like. Without something like that, it's only a guess.
Is this the only page you have? A lot of schematics like that have at least one page devoted to abbreviations and the like. Without something like that, it's only a guess.
I can also see that the OHNS is indicated by something on each track - one on the UP and one on the DOWN. The indicator is a little square box. Hotbox detector or something like that maybe? Or, possibly something on the overhead wiring like a fuse or breaker?
I can also see that the OHNS is indicated by something on each track - one on the UP and one on the DOWN. The indicator is a little square box. Hotbox detector or something like that maybe? Or, possibly something on the overhead wiring like a fuse or breaker?