Chicago L 4000 Series (Rail Grinder)These are N scale 3D printable files for the Chicago Transit Authority (CTA) 4000 Series Rail Grinder Work Car S 1 "Shhhicago" a one of a kind piece of Chicago 'L' history representing a car from the first series of 4000 series cars (40014250), built by the Cincinnati Car Company in 1914 and later converted from revenue passenger service into a rail grinding work car, renumbered as Work Car S 1 and given the memorable name "Shhhicago". Designed to fit
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