Adding weights to passenger cars to stop derailments?

[Green_Elite_Cab]

I don't think weight ever really helps, i think it just hides problems. True, it is possible for a car to be underweight, and that would make it extra jumpy. However, there seems to be an obession with loading down cars with ridiculous amounts of weight. I feel that passenger cars and the long cars like autoracks suffer the most from the NMRA's "weight formula".

I notice that in my Walthers Comet commuter cars, additional weight causes drag on the wheels, holding my trains up. Meanwhile, at factory weight, they perform extremely well even on bad track, while being pushed at top speed, even through switches.