OMI GATX 8K insulated tank is too big?

nyc3001 .

I took out my GATX 10k (OMI 3229, painted) and 8k (OMI 3270, unpainted) insulated tank cars and found that they were the same size and length. I'm aware that varying amounts of insulation could account for their same size, but I'm still wondering whether or not the 8k tank is too big.

-Phil Lee
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