A Terminal Railroad Association of St. Louis train sits on their North Belt Sub. Heading the train are two Helm Leasing GP38-2s, which replaced the longstanding and familiar red SW1500s. These units will soon receive a new and very attractive TRRA paint scheme. 1/8/2010. This unit has been around the block, starting life as Lousiville and Nashville 4001 in June of 1970, then Seaboard System 6223, CSXT 2131, then on to Union Pacific as their 2404, renumbered to #904, then on to Helm Leasing Corporation 904.