Rapido 606-70121 HO Scale CF7 Square Cab DCC READY Amtrak 583 ex Santa Fe 1984+ August 16, 2026 By 0 In the late 1960s, Santa Fe{s F-unit fleet was nearing the end of its lifespan. Throughout the CF7 rebuild program, many variations did occur. Most notably were the cab profiles and the side sills.