The 4050 series cars were built new at the West Wichita shops in the fall of 1953. The Lambert car is somewhat crude but is the only model available for this car. Originally they were painted coach green with black roofs, underframes and trucks. Lettering was Dulux yellow with Santa Fe on the letterboard. They were repainted in 1956 to receive a a red REA diamond to the right of the door. This was further modified in 1960 to a red diamond with white "X".