. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . al features,there are a number of points that areworthy of attention The depth of thefirebox throat, from the under side of theboiler barrel to the bottom of the mud- handled, as one type of locomotive canbe used in either fast or slow traffic. The following are the general dimen-sions Gauge, 4 ft. 8yi ins.; cylinders, 27 30 ins.; valves, piston, 15 ins. diameter. Boiler.—Type, straight; diameter, 82ins.; thickness of sheets, J^-in.; workingpressure, 185 lbs.; fuel, soft coal;Staying, r
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . al features,there are a number of points that areworthy of attention The depth of thefirebox throat, from the under side of theboiler barrel to the bottom of the mud- handled, as one type of locomotive canbe used in either fast or slow traffic. The following are the general dimen-sions Gauge, 4 ft. 8yi ins.; cylinders, 27 30 ins.; valves, piston, 15 ins. diameter. Boiler.—Type, straight; diameter, 82ins.; thickness of sheets, J^-in.; workingpressure, 185 lbs.; fuel, soft coal;Staying, radial. Fire Box.—Material, steel; length, o ins.; width, i<4 ins.; depth, front89r4 ins.; depth, back, 75M ins.; thicknessof sheets, sides, %-in.; back, M-in.;crown fs-in.; tube, \i in. Water Space.—Front, 5 ins.; sides, 5ins.; back, 5 ins. Tubes.—Material, steel; diameter, 53-6ins. and 2 ins.; thickness, 53/s ins., No. 9W. G.; 2 No. 11 W. G.; number,5% ins., 36; 2 ins., 262; length, 20 ft. 6 ins Heating Surface.—Fire box, 241 sq. ft.;tubes, 3,833 sq. ft.; firebrick tubes, 32 sq. MIKADO TYPE LOCOMOTIVE FOR THE PERE MARQUETTE i. J. T. Waters, Superintendent of Motive Power. tion. Hence, at a given speed, a Mikadotype locomotive will haul a greater ton-nage than a Consolidation; or with thesame tonnage, it will make better a constructive standpoint theMikado type also possesses advantages,because there is room above the trailingtruck for a firebox having not only largegrate area, but also ample depth andvolume. This provides sufficient spacebetween the grate and bottom row oftubes for a brick arch, which is an im-portant aid to combustion when burningbituminous coal. In heavy Consolidationtype locomotives with comparatively largedriving-wheels, the firebox throat is neces-sarily so shallow that it is difficult, if notimpossible, to apply a satisfactory designof arch. The Pere Marquette Railroad has re-cently placed in service ten BaldwinMika
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