Roster:

	USNX 1013-1078						(to ATMX 1006-1012?; to MHAX 12xx-12xx?)
								(to MHAX 1013-1078)
		

These xx0 ton helium cars were built by GATC in 11/1930-8/1943. They featured 30 tubes arranged five high by six wide.

A group of 7 cars were relettered ATMX 1006-1012? around 1955.

The reporting marks on these cars was changed to MHAX after 1964.

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