The problem is back in the group C/A era, after a leading car's job was finished, only the newer replacement car really mattered.
Once a category was finished, the obsolete cars were not worth much. Sierras were particularly hard to move on once group A had finished.
Now these cars are worth a fortune, and an accompanying detailed vehicle linage is expected. It's just this situation was never really anticipated when the cars were originally being disposed; and piecing their details together now relies on the efforts of amateur historians
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