In the third of Pentrex's three-volume series about the incredible Alco diesel, the Century models show their muscle. These 251-powered locomotives were the last group produced by Alco before operations ceased in 1969. Montreal Locomotive Works continued to build these Alco-designed diesels until selling to Bombardier, which carried the torch until 1988. The progression of models built by these three companies is followed in chronological order to bring our series to a close.

The search for sleek Century behemoths took us throughout North America. Surviving Alco C415, C420, C424, C425, C430, C628, C630, and C636 locomotives are viewed on main lines, shortlines, and industrial operations. MLW's RS37, C630M, M630, M636, M420, M420B, M420R, M420TR, and M420TR2 diesels lug, chug, and put on fantastic shows in the U.S., Canada, and Mexico. Bombardier LRC, M424, and HR616 units bring the series to an end.

Our show conclu