American Limited Models General American TK-O class Tank Car: Atchison Topeka & Santa Fe - Car Journal Oil w/ Orange Stripe - modernized w/ roller bearing trucks
In the years following World War II, Santa Fe Railway purchased two groups of welded tank cars delivered in 1949 and 1953, respectively. Prior to these two car classes, riveting was the primary method of assembling cars. Conversely, the TK-N and TK-O cars had welded bodies and underframes. Freight car builder General American's retooling during and after the war allowed it to offer improved car designs and enhanced construction methods. Santa Fe ordered these tank cars equipped with AB brakes, Ajax handbrakes, and 70-ton ASF A-3 Ride Control trucks. Santa Fe adopted a color-coding system to delineate the tank car's lading. As such, these cars wore more colorful paint schemes than typical tank car fleets. The railroad upgraded many of these cars with modern safety appliances beginning in the 1970s, which included installing roller bearing trucks and removing the lower side walkways. The safety railing designed to keep employees from under the car replaced the lower side walkways. Many of these cars lasted up until the 1990s in company service, having been rebuilt yet again for diesel fuel transportation or Maintenance-of-Way service.