I just realized that, in my response to Armand, I overlooked PGX 54
and PQX 54. PGX 54 is apparently a recording error; the PGX
reporting marks were not in use in 1950. PQX were the reporting
marks for the Philadelphia Quartz Co., and PQX 54 was one of cars
numbered 47, 49, 50, and 55 which were, like almost all of the
company's 118 tank cars, AAR class TM with 50 tons nominal
capacity. The low numbers and the gaps in the number sequence
suggest that these were older cars, some of which had been wrecked
or retired. They were probably 8,000 gal. cars, though PQX did
have a few 10,000 gal. cars, and were certainly ICC-203s or the
earlier equivalent thereof, i.e. with single frangible disk vents
instead of safety valves, as all PQX cars were used in silicate of
soda service and that 's a non-regulatory commodity.

Richard Hendrickson






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