The Roger Williams was a streamlined, six car, lightweight, DMU passenger train, built by the Budd Company in 1956 for the New York, New Haven and Hartford Railroad. The train was based on Budd's successful RDC DMU cars. The end two cars were equipped with streamlined locomotive style cabs and noses, resembling those on the Fairbanks-Morse P-12-42 Diesel locomotives. The four intermediate cars lacked operating controls and cabs. The two end cars, and one intermediate car, are preserved in operating condition, by a private owner, at the Danbury Railroad Museum in Danbury, Connecticut