The Red Wing 3470 Engineer Black Boundary boot was developed for America’s railroad engineers in the early 20th century. The Red Wing Engineer 3470 is an all-leather boot used to protect the engineer’s feet from the hazards in locomotive cabins. The Red Wing 3470 Engineer boot has split at the top of the shaft that allowed the engineer to bend during work. The Red Wing Engineer first appeared in the Red Wing catalog of 1941. This black Red Wing Engineer is made from Black Boundary, a premium full-grain leather made in Red Wing’s S.B. Foot Tannery. Red Wing Black Boundary has a nice and soft surface feel.The Red Wing 3470 Engineer boot has a Traction Tred Cushion Crepe sole and is also available in Copper Rough & Tough.