I have numerous examples with the 21.
All were discounted - previously PMD / Zone cars.
They also used 30, 35, 40 and SP - as indicators.
Have never been able to find out, or glue together complete solid definitions on any except the SP.
Which was special bidding (SP).
Usually cars with high use - or cars that stuck around too long.
The numerical codes seem to be an identifier of a certain amount of discount.
But not the same % as their face value.
Just a classification.
21 is usually associated with 5% cars - i try not to use the word ~always~ when discussing these discount cars. The math factors are wacky and i don't want to try to crunch them.
.00 Hold Back is another indicator on these.
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