. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . i ins.; depth, back, ins.;thickness of sheets, sides, s in. ; thicknessof sheets y% in.; crown. -V& in.; tube, yi in. Water Space—Front. 5 ins.; sides andback, \l/2 ins. Tubes—Diameter, 5$i 2 ins.: material. 5f6 ins. steel, 2 ; thickness, 5-Vg ins. No. 9 W. G.,2 ins. No. 11 W. G.; number, 5^i ins. 36,2 ins., 227; length, 18 ft. 2 ins. Heating Surface—Fire box. 208 sq. ft.;combustion chamber, 46 sq. ft.; tubes,3,065 sq. ft.; firebrick tubes, 26 sq. ft.;total, 3,345 sq. ft.
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . i ins.; depth, back, ins.;thickness of sheets, sides, s in. ; thicknessof sheets y% in.; crown. -V& in.; tube, yi in. Water Space—Front. 5 ins.; sides andback, \l/2 ins. Tubes—Diameter, 5$i 2 ins.: material. 5f6 ins. steel, 2 ; thickness, 5-Vg ins. No. 9 W. G.,2 ins. No. 11 W. G.; number, 5^i ins. 36,2 ins., 227; length, 18 ft. 2 ins. Heating Surface—Fire box. 208 sq. ft.;combustion chamber, 46 sq. ft.; tubes,3,065 sq. ft.; firebrick tubes, 26 sq. ft.;total, 3,345 sq. ft.; superheater, 792 ; grate area, sq. ft. Driving Wheels — Diameter, outside,68 ins.; diameter, center. 62 ins.; journals,main, 10J/j ins. x 20 ins.: journals,others, 9/? ins. x 12 ins. Engine Truck Wheels — Diameter,front, 31f£ ins.; journals. 6 ins. x 10^4. R. E. Smith. Genl. Supt. Motive Power. heavy, and 12-car steel trains must liehauled on exacting schedules. The linealso handles a large amount of perish-able freight, which is moved on fastschedules. The weight on drivers is lim-ited to an amount that can be safely car-ried on 85-lb. rails, and in view of this, amost satisfactory design of locomotivehas been produced. Comparing Classes P-3 and P-4. accord-ing to the nomenclature used on this rail-way, it is evident that the additionalweight of the newer engine has beenutilized chiefly in providing a largerboiler. The diameter of the shell at thefirst ring has been increased 10 ins., andthe result is a marked increase in thesustained horsepower capacity of thelocomotive. At the same time, thecylinder diameter has been increasedfrom 22 to 23 ins. With a tractive forceof 37,000 lbs., and a weight on the driversof 151,050 lbs., Class P-4 has a ratio ofadhesion of Although the drivingwheels are of moderate size, their dia- ATLANTIC
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