. Railway mechanical engineer . Booster and Delta Truck Used on Mikado Locomotives are operating with exhaust nozzles from l/> in. to ;>4 than was previously possible and are showing animproved fuel record and better performance in general thanthe older design of locomotives. A table showing the principal dimensions and ratios of thefour types of locomotives is given for comparison with Speed Speed Typical Indicator Cards of the 2-10-2 type had 29>4 in. by 32 in. cylinders and theolder engines 27^ in. by M in. cylinders, both designs hav-ing
. Railway mechanical engineer . Booster and Delta Truck Used on Mikado Locomotives are operating with exhaust nozzles from l/> in. to ;>4 than was previously possible and are showing animproved fuel record and better performance in general thanthe older design of locomotives. A table showing the principal dimensions and ratios of thefour types of locomotives is given for comparison with Speed Speed Typical Indicator Cards of the 2-10-2 type had 29>4 in. by 32 in. cylinders and theolder engines 27^ in. by M in. cylinders, both designs hav-ing 63J,j in. wheels. These changes give the new Pacifictype locomotives per cent higher piston speed for thesame running speed and whereas the older locomotives havea piston speed of 1,000 ft. per min. when running at p. h. the new locomotives have the same piston speed whenrunning at m. p. h. For heavy mountain passengerservice on long grades up to per cent, the higher relative piston speeds are giving better results, as would be expectedfrom tin- fait that the maximum horsepower of superheatedlocomotives is obtained at a piston -peed of approximately 1,000 ft. per min. or higher. lu determine the effect of tin- long stroke on the meaneffective pressure developed, a number of tin- tests wit madewith 2-10-2 type locomotives, Southern Pacific (lass F-l,built in IM 7 and IM). These engine- hav
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
