. Railway and Locomotive Engineering. expansion links. Thedepth of the throat, measured from theunder side of the barrel to the bottom ofthe mud ring, is 25 in. This pro-vides ample room for the brick arch,which is supported on four 3-inch watertubes. The superheater is of the Schmidttype. It provides sq. ft. of tlirougli lugs cast in the solid frames. The steam pipes in these locomotivespass out through the sides of the smokebox, and deliver steam directly to thesteam chests. The steam distribution iscontrolled by 16-in. piston valves whichare driven by Baker gear. Tlie valvesare set wi
. Railway and Locomotive Engineering. expansion links. Thedepth of the throat, measured from theunder side of the barrel to the bottom ofthe mud ring, is 25 in. This pro-vides ample room for the brick arch,which is supported on four 3-inch watertubes. The superheater is of the Schmidttype. It provides sq. ft. of tlirougli lugs cast in the solid frames. The steam pipes in these locomotivespass out through the sides of the smokebox, and deliver steam directly to thesteam chests. The steam distribution iscontrolled by 16-in. piston valves whichare driven by Baker gear. Tlie valvesare set with a maximum travel of 6 constant lead of J4 in- The steamlap is 1 in., and the exhaust clearance1-16 in. The valve motions are con-trolled by the Ragonnet power gear. The tender is of the Vanderbilt type,with capacity for 9,000 gallons of waterand 16 tons of coal. The tank has adiameter of 8 ft. 9 in., and the frame of 6x4 in. angles, with steelbumpers. The trucks have cast steelside frames and steel tired Sclilafge. (General Media 2-8-2 TVPE OF LOCOMOXnES FOR THE ERIE R.\ILRO.\ Superintendent. notive Works, Builders. per cent., in weight on driving wheels of31 per cent., and in total equivalent heat-ing surface of 83 per cent. The H-21locomotives use saturated steam whilethe N-1 engines are equipped with fire-tube superheaters. In making the abovecomparison each square foot of superheat-ing surface is considered equivalent toI1/2 square feet of water evaporatingsurface. On the basis of water evaporat-ing surface alone, the N-1 locomotivesshow an increase of 33 per cent, over theclass H-21, and this is practically in pro-portion to the increase in tractive , the increase in relative boilercapacity, measured on a heating surfacebasis, is provided by the superheater, andis approximately 50 per cent. This meansincreased hauling capacity for the new superheating surface, and the elementsare located in 36 tubes each 5/2 in. indiamet
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