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I know some of the weight and length of cars goes by I believe a half ounce per length. But there use to be a table that allowed for a car length say going from 40'- 45' at a certain weight. and goes up as the car length increases. Does anyone know or have that table?
 

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the NMRA guideline for HO is 1 oz plus 0.5 oz per 1" (corrected) of length

ft inch oz
30 4.14 3.07
35 4.83 3.41
40 5.52 3.76
45 6.21 4.10
50 6.90 4.45
55 7.59 4.79
60 8.28 5.14
65 8.97 5.48
70 9.66 5.83
75 10.34 6.17
80 11.03 6.52
85 11.72 6.86
90 12.41 7.21
95 13.10 7.55
 

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Actually, the NMRA standard for HO is 1oz plus an additional 0.5 oz per INCH of car length. Which is pretty close to what your table actually shows.

See the actual Recommended Practice document here: https://www.nmra.org/index-nmra-standards-and-recommended-practices (RP 20.1)

FWIW, my programming track also has RP weights marked innit, as well as a coupler height gauge:

IMG_20170305_145638620.jpg
 
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