 The Texas type on the Santa Fe is by design a Berkshire with an additional driving axle, as it was ordered by most railroads.Although Santa Fe 3829 was the first steam locomotive with the 2-10-4 wheel arrangement, Santa Fe 5000 served as the prototype for all further 2-10-4 locomotives rostered by the road.In 1930, Santa Fe looked at the contemporary heavy-duty motive power policies of other railroads, and decided that its own needed substantial reappraisal.