From 1923 through 1926, Baldwin Locomotive Works built 175 class M1 4-8-2s for the Pennsylvania, including No. 6919 shown here in the photo purchased via eBay for which no information is available (the location may be East St. Louis). Due to PRR's practice of standardization the dimensions of the M1 class were virtually identical to those of the M1a class, except that their weight is given as 385,850 pounds. All M1s and M1as had 4698 square feet of evaporative heating surface, 1634 square feet of superheating surface, and a grate area of 70 square inches; for other specifications see the preceding page for No. 6747. Many locomotives of both groups featured the 16-wheel "coast to coast" tender as shown here with No. 6919.