Weight per yard	Standard	Height
12 lb	ASCE	2"
16 lb	ASCE	2 3/8"
20 lb	ASCE	2 5/8"
25 lb	ASCE	2 3/4"
30 lb	ASCE	3 1/8"
35 lb	ASCE	3 5/16"
40 lb	ASCE	3 1/2"
45 lb	ASCE	3 11/16"
50 lb	ASCE	3 7/8"
55 lb	ASCE	4 1/16"
60 lb	ASCE	4 1/4"
65 lb	ASCE	4 7/16"
70 lb	ASCE	4 5/8"
75 lb	ASCE	4 13/16"
80 lb	ASCE	5"
85 lb	ASCE	5 3/16"
90 lb	ASCE	5 3/8"
100 lb	ASCE	5 3/4"
110 lb	ASCE	6 1/4"
112 lb	AREA	6 5/8"
115 lb	AREA	6 5/8"
119 lb	AREA	6 13/16"
130 lb	AREA	6 3/4"
131 lb	AREA	7 1/8"
132 lb	AREA	7 1/8"
133 lb	AREA	7 1/16"
136 lb	AREA	7 5/16"
140 lb	AREA	7 5/16"

ASCE = American Society of Civil Engineering
AREA = The American Railway Engineering Association
TX Holdings Rail Chart
Wikipedia - Rail Profile
NMRA Rail Size