Baldwin Locomotive Works produced several different Baldwin DR-6 models of 6-axle passenger train-hauling diesel locomotives between 1945 and 1948. The series comprised eight individual versions, all of which sold only in small numbers; across all versions, only 39 locomotives were produced. Each version was produced only for a single railroad. Many shared the same Baldwin model number, DR-6-4-2000, even though they were rather different; this was because the Baldwin model only encoded the total axles (6), the driven axles (4) and the power output (). The single exception was the single unit produced for the Chicago and North Western Railway, which had a single engine and was model number DR-6-2-1000. In the AAR wheel arrangement scheme of classification, these locomotives were of A1A-A1A and A1A-3 arrangements, respectively. Baldwin demonstrators The first produced version comprised a pair of DR-6-4-2000 demonstrators built in 1945. This, unlike later models, used Baldwin's Inline-8 8VO engine model. These locomotives had a unique cab that featured the same upright, aggressive prow as the 30 Baldwin 0-6-6-0-1000/1DE C-C units built on a U.S. Army order in June 1945 for shipment to the Soviet Railways as part of a Lend-Lease. They emerged as Baldwin #2000 and #2001, with #2000 built in January and #2001 built in March. After demonstrating on the Illinois Central, Chicago and Eastern Illinois, Union Pacific, and a number of other railroads, they were sold to Ferrocarriles Nacionales de México (NdeM) in August 1945 and assigned road #6000 and #6001. Both were scrapped in September 1957. 608NA-engined DR-6-4-20 locomotives Three different railroads ordered the DR-6-4-2000 model with the 608NA 8-cylinder naturally aspirated engine, but in visually different forms. CNJ locomotives The Central Railroad of New Jersey ordered six DRX-6-4-2000 locomotives for its then-subsidiary Wharton and Northern, #2000–#2005, which were unusual for North American diesel locomotives in that they had driving cabs at both ends. The first three #2000-2002 had the cab doors on the same level as the locomotive frame, and were delivered with an orange roof. The last three had their doors on the cab floor level and were delivered with a dark blue roof. On the CNJ they were known as "Double-enders". The cab style was nicknamed "Babyface" and was used by several other Baldwin models. The original paint scheme was a deep, rich blue on the lower part of the locomotive and tangerine on the upper part. Almost all were retired around