sub-station

From sub- +‎ station

sub-station (plural sub-stations)

1. (electricity) Alternative form of substation.
   • 2012, Andrew Martin, Underground Overground: A passenger's history of the Tube, Profile Books, →ISBN, pages 118-119:

     The stations, lifts and trains were all brightly lit with electricity, and there was no question of voltage drop from being too far from the source of the power because the Central was the first line long enough to justify the building of sub-stations along the route.

• bus station