 All were air-conditioned; and 90% were easy-to-maintain stainless steel.When Amtrak took over, passenger cars and locomotives initially retained the paint schemes and logos of their former owners which resulted in Amtrak running trains with mismatched colors – the "Rainbow Era".In mid-1971, Amtrak began purchasing some of the equipment it had leased, including 286 EMD E and F unit diesel locomotives, 30 GG1 electric locomotives and 1,290 passenger cars.