New Haven Railroad - R2a Mountain
R-2 3500 was the precursor of twenty additional high horsepower Mountain-type engines of similar design. All twenty-one were built by Schenectady starting with 3500 in 1924, 7 additional R-2's in 1926 distinguished by high boiler pressure (3501-07), three R-3's with three cylinders in 1926 (3550-52), and ten more in 1928 (3553-62). All were equipped with water-tube fireboxes which were not successful and soon replaced. Ultimately all New Haven engines originally delivered with the McClellon boiler had a conventional boiler fitted in 1929. The specs refer to the later boiler, whose firebox heating surface area included 101 sq ft (9.38 sq m) in the combustion chamber and 95 sq ft (8.83 sq m) of thermic syphons. Other problems included a balky DuPont-Simplex mechanical stoker (replaced by an HT-2 in the 1930s) and Southern valve gear replaced by Walschaerts or Baker gear. The design also came equipped with a feedwater heater and a valve motion with limited cutoff. 14" (356 mm) piston valves supplied steam to the cylinders. The R-2s ran until 1949-1951.
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