@Jim Scorse posted:O Scale rail code equivalencies to HO rail:
148 in O is equal to code 83 in HO or 132-140 pound rail (probably the most common modern mainline rail)
125 in O is equal to Code 70 in HO or about 100-110 pound rail (most common on secondary trackage or sidings)
100 in O is equal to code 55 in HO or about 75-80 pound rail (suitable for little used spurs or early 20th century secondary trackage)
83 in O is equal to code 46 in HO or about 60 pound rail
Something is off with that table. Those conversions are off. Not by much, but they are all off
O Scale 1/48 scale
HO Scale 1/87 scale
Ratio is 87/48 = 1.813
Now look at the conversions
148/83 = 1.783
125/70 = 1.786
100/55 = 1.818
83/46 = 1.804
They all should be 1.813
The numbers are not even consistent! The biggest error is only 1.7%, But still, the math ain't THAT hard
What is also off is the equivalece, There is no range of heights for a given weight. There is a direct relation between code and rail weight. As I said in my post above, 140 lb rail corresponds to 7 5/16" high which is Code 151 in O scale.
