The Geo D. Whitcomb Company's largest knitting machinery customer was the Vassar Swiss Knitting Company of Rochelle, in northern Illinois. In 1907, the company moved to Rochelle, where they continued to build knitting machinery and gasoline powered locomotives for coal and metal mines. The demand for gasoline locomotive required larger production facilities. In 1912 the plant was moved to larger facilities in Rochelle. The company ended its knitting machinery production to concentrate on locomotive production.
George Dexter Whitcomb died in 1914, in Los Angeles, California. His son, William Card Whitcomb, assumed control of the company. William was responsible for sales, accounting and engineering.
During World War I the Whitcomb plant was devoted to government orders. Hundreds of armor-plated locomotives were built for overseas service on trench railways in France. These small 6-ton and 9-ton, narrow gauge locomotives proved highly efficient in trench warfare and they were used extensively in hauling needed supplies up to the front lines. The Whitcomb Company received the "Certificate of Merit" from the United States War Department.
Many new innovations in the locomotive field were being introduced during this period. The first explosion-proof electric mine locomotive was designed and built by Whitcomb, in 1914. After exhaustive tests the United States Bureau of Mines issued Whitcomb a "Permissibility Plate." Whitcomb was the first builder of locomotives for underground work to receive such an endorsement. The first Whitcomb electric trolley locomotive was produced in 1921, and in 1929 Whitcomb engineers designed and built the largest gasoline-electric locomotive that had then been offered to American railroads. This development was closely followed by the diesel-electrics, which revolutionized and forever changed the American rail transportation system.
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In September 1926 William Whitcomb now relaxed his personal oversight of the operation of his company. He hired Carl Heim from Chicago, to take over many of the company's operations management, including in the positions of Vice President and Treasurer.
Partin-Palmer automobile
From 1914 to at least 1916 the Geo D. Whitcomb Company assembled Brass Era cars in Rochelle for an automobile company, named Partin-Palmer.
The Partin Mfg. Co. was a large automobile sales agency in Chicago, that in 1913 joined with the Palmer Motor Car Co. of Henry Palmer in Detroit, to manufacture cycle cars, with a model called Partin-Palmer. The company first moved to Chicago to take over the Staver-Chicago automobile factory. By 1914, Partin and Palmer were no longer with the company, and it moved to Rochelle where the Geo D. Whitcomb Company assembled them for a year.
In 1915 the company got into financial trouble in Chicago, and the car's name was changed to Commonwealth (1917–1922). In the 1916 catalog of the Commonwealth Motors Company, it states that Partin-Palmer automobiles were being produced in Rochelle under the personal supervision of Mr. W. C. Whitcomb, vice-president of the Commonwealth Motors Company. Production moved to Joliet, Illinois. In 1922, Leland Goodspeed designed a new car for the company, which became the Checker Cab.
A restored Partin-Palmer automobile is displayed at the Flagg Township Museum in Rochelle, Illinois.