15-22 Average Static Load of Freight Cars
(ton/car)
Year	Total	#Coal	#Petroleum	#Steel and	#Mineral Building	#Grain
				Iron	Materials
1952	28.9	32.5	27.3	27.8	32.5	32.0
1957	34.7	38.3	35.0	37.2	38.8	39.2
1962	39.0	42.3	39.5	41.4	43.0	40.5
1965	39.8	44.6	40.4	42.6	44.0	43.7
1970	42.5	46.9	42.8	43.5	47.2	45.5
1975	45.4	49.4	44.3	46.3	48.6	47.8
1978	46.9	50.6	46.3	47.5	49.9	50.3
1980	48.0	52.5	46.3	49.0	52.6	54.2
1985	51.6	55.7	46.2	51.9	55.3	54.6
1986	52.2	56.2	46.3	52.8	56.0	55.3
1987	53.2	57.2	46.5	53.6	56.7	56.6
1988	54.1	57.9	46.7	54.2	57.4	57.3
1989	54.8	58.3	46.8	54.6	57.6	57.8
1990	55.0	58.5	47.0	55.0	57.9	58.3
1991	55.2	58.7	46.7	55.6	58.0	58.5
1992	55.8	59.1	47.1	56.4	58.3	58.9
1993	56.1	59.3	47.4	57.1	58.5	59.1
1994	56.6	59.6	47.6	57.8	59.0	59.3
1995	56.8	59.9	47.6	58.2	59.2	59.4
1996	57.1	60.0	47.5	58.5	59.4	59.6
1997	57.3	60.2	48.0	58.6	59.4	59.6
1998	57.6	60.8	48.6	58.9	59.7	59.7
1999	57.7	61.1	49.2	59.1	59.9	59.6