http://dewey.info/scheme/e22/
620 Engineering
625 Engineering of railroads & roads
http://dewey.info/scheme/a14/ 625 Engineering of railroads and roads
625.1 Railroads 625.2 Railroad rolling stock 625.3 Inclined, mountain, ship railroads 625.4 Rapid transit systems 625.5 Cable and aerial railways 625.6 Surface rail and trolley systems 625.7 Roads 625.8 Artificial road surfaces
http://dewey.info/scheme/edition/e23/
62 Engineering
625 Engineering of railroads and roads
625.1 Railroads 625.2 Railroad rolling stock 625.3 Inclined, mountain, ship railroads 625.4 Local rail transit systems 625.5 Cable and aerial railways 625.6 Light rail transit systems 625.7 Roads 625.8 Artificial road surfaces
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