This McKeen Motor car was built in February of 1906 as Union Pacific motorcar #4. Later it was renumbered UP Motor car M-4. UP M-4 (1st) was destroyed by the same fire that also destroyed the Grand Island, Nebraska, roundhouse in November 1922; salvaged engine was used in M-22. Specs - McKeen serial #4 Riotti 100hp motor, 55'-2" body length, car wt of 35 tons, 57 seats, original cost of $17,475.87. No date, location or photographer was listed for this photo so approximates were used for posting.