In 1955 The Santa Fe Railroad introduced the RR-56 class of Refrigerated boxcars. Based on the previous RR-54 class of Boxcars, the RR-56 class incorporated lessons learned from the older series of cars to build & operate its 1st large fleet of Mechanical Reefers.
The RR-56 were classed as All Purpose MTC (Mechanical Temperature Control) cars by the Santa Fe Railroad. The fleet numbered 200 cars numbers 2000 2188, 2500 2510 in the series. Delivered with SFRD reporting marks, these were changed in 1963 to SFRP but retained their original car numbers.
In 1958, Santa Fe built the RR-60 & RR-61 class of Reefers. These were additional cars built to the same external standards as the RR-56 class but carried different insulation & so were identified as Super Insulated “All Purpose” Mechanical Temperature Controlled cars.
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