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The amount of track marks on the arm of a junkie. This also pertains to someone who works in a factory where handingling cardboxes all day will have a few paper cuts.
'Jesus, did you see the track marks on Crystal's arm? Talk about a fucking railroad yard.'

'Man, I worked a ten hour shift. All I have to show is this train yard from all the box cuts.'
by Corkscrew Foley November 03, 2009
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