A passthrough charging system for replacing and charging each ofa plurality of battery units
11 mountable within one of a plurality ofreceptacle cars 12A. The charging system comprises:
(a) a passthrough rail line 17 configured to provide ingress and egress through a chargrng
station (10A,10B) for each receptacle car 12A positioned  on the pass-through rail line 17, and
(b) at least one platform transfer tool located in the charging station (10A, t0B). Each platform
transfer tool is configured to, for each receptacle car 12A including at least one battery unit
11 of discharged status: (i) receive each battery unit ll of discharged status from the receptacle
car l2!r; (ii) place each battery unit ll of discharged status onto a charging platform 15 of the
charging station (10A, 10B) for charging by at least one charging pile 16 during a charging session; and (iii) retum at least one ofthe battery units ll ofrecharged status from the charging
platform 15 into the receptacle car 12A.