Original sentence: The were re-painted into two 2 different paint schemes and served from the 1950s to the late 1960s due to the WSS realizing it wasn't cost effective to maintain servicing facilities, so the GP9s went back to their respective owners and the WSS started to lease equipment from the ACL and N&W, and to this day, the WSS continues to lease road power from the successors of the ACL (CSX) and N&W (NS)
Edited sentence: They were re-painted into two different paint schemes and served from the 1950s to the late 1960s, when the GSS, realizing it wasn't cost-effective to maintain servicing facilities, sent the GP9s  back to their respective owners and started to lease equipment from the ACL and N&W.To this day, the WSS continues to lease road power from the successors of the ACL (CSX) and N&W (NS)