 The first was the GP8, second the GP10 and third the GP11.All were rebuilt at IC/ICG's Paducah Shops in Kentucky.Core units for the GP10 program were from IC/ICG GP7, GP8, GP9 and GP18, B&M GP9, B&O GP9, CRR GP9, C&O GP7 and GP9, D&RGW GP9, DT&I GP7 and GP9, FEC GP9, GTW GP18, P&LE GP7, Potlach Forests Inc. GP7, QNS&L GP9, RDG GP7, St.J&LC GP9, SLSF GP7, SP GP9, SSW GP7, and UP GP9B.