Tank cars assigned to molasses service tend to be older,smaller capacity
cars of whatever era you are studying.
They generally are non insulated with either interior or exterior heater
coils. The molasses usually goes into animal feed and sets up very hard in
the cars and therefore the heater coils. In the 80s,90s and today molasses
cars tend to ne what are referred to as HP20s or IXC 20s(Heater piped 20s or
insulated exterior coiled 20s). Basically the industry used the oldest cars
they could lease.
Also of interest molasses does corrode carbon steel when heated to make it
flow out of the car. I've seen many a molasses car so thin on the top that
a man would be afraid to walk on the top for fear of breaking thru thu the
thin remaining shell. Federal rule HM 201 solved that and many have gone to
scrap.
Leo Phillipp
40 years(and still going) in the RR industry of which 21+was in the tank
car fleet management side.
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