JMHX 351-375
JHMX 351-375 (to JMHX 41351-41375 in 1969)
These cars were built by Thrall in 5-7/1963 and featured 3524 ft3 capacity. At some point, they were enlarged to 3950 ft3 probably in the late 1960's when they were renumbered into the JMHX 39xxx series.