| 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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