My wife and are trackside at Cape Girardeau waiting for the steam locomotive to come by. It's due at 2:30 but I've heard it's running a little behind. I'm stoked!
After watching the videos of SLSF 4500 being moved in Tulsa, plus seeing UP 844 here in StL last week, I'm wondering what a comparison of specs between the Union Pacific FEF class, UP 800-844, and the Frisco 4500 class, SLSF 4500-4524, would reveal side-by-side. Does anybody have the data? Both very impressive, huge engines! Ken
Sure ....here you go. Courtesy of steamlocomotives.com The table format doesn't seem to want to "port" over. You can quickly see that the 4500 had more tractive effort. First, Union Pacific FEF-3 ClassFEF-3Locobase ID8340RailroadUnion Pacific (UP)Whyte4-8-4Road Numbers835-844GaugeStdBuilderAlcoYear1944Valve GearWalschaertLocomotive Length and WeightDriver Wheelbase22'Engine Wheelbase50.92'Ratio of driving wheelbase to overall engine wheebase0.43Overall Wheelbase (engine & tender)98.42'Axle Loading (Maximum Weight per Axle)Weight on Drivers266490 lbsEngine Weight486340 lbsTender Light Weight421550 lbsTotal Engine and Tender Weight907890 lbsTender Water Capacity23500 galsTender Fuel Capacity (oil/coal)6000 galsMinimum weight per yard of rail on which locomotive could run111.04 lb railGeometry Relating to Tractive EffortDriver Diameter80"Boiler Pressure300 psiCylinders (dia x stroke)25" x 32"Tractive Effort63750 lbsFactor of Adhesion (Weight on Drivers/Tractive Effort)4.18Heating AbilityFirebox Area442 sq. ftGrate Area100.20 sq. ftEvaporative Heating Surface4225 sq. ftSuperheating Surface1400 sq. ftCombined Heating Surface5625 sq. ftEvaporative Heating Surface/Cylinder Volume232.39Computations Relating to Power Output (More Information)Robert LeMassena's Power Computation30060Same as above plus superheater percentage37541.60Same as above but substitute firebox area for grate area165602.67Power L141880.01Power MT1385.86 Next - SLSF 4500 Class4500Locobase ID277RailroadSt Louis-San Francisco (SLSF)Whyte4-8-4Road Numbers4500-4524GaugeStdBuilderBaldwinYear1943Valve GearWalschaertLocomotive Length and WeightDriver Wheelbase19.25'Engine Wheelbase46.50'Ratio of driving wheelbase to overall engine wheebase0.41Overall Wheelbase (engine & tender)Axle Loading (Maximum Weight per Axle)70620 lbsWeight on Drivers280000 lbsEngine Weight462500 lbsTender Light Weight241300 lbsTotal Engine and Tender Weight703800 lbsTender Water Capacity18000 galsTender Fuel Capacity (oil/coal)24 tonsMinimum weight per yard of rail on which locomotive could run117 lb railGeometry Relating to Tractive EffortDriver Diameter74"Boiler Pressure255 psiCylinders (dia x stroke)28" x 31"Tractive Effort71188 lbsFactor of Adhesion (Weight on Drivers/Tractive Effort)3.93Heating AbilityFirebox Area544 sq. ftGrate Area88 sq. ftEvaporative Heating Surface4766 sq. ftSuperheating Surface1530 sq. ftCombined Heating Surface6296 sq. ftEvaporative Heating Surface/Cylinder Volume215.72Computations Relating to Power Output (More Information)Robert LeMassena's Power Computation22440Same as above plus superheater percentage27826Same as above but substitute firebox area for grate area172013Power L130259Power MT952.99
