Re: Uintah 2-6-6-2s and the Rio Grande

For informations sake the 250/251 on the SVRy were listed as having 182,000 lbs on drivers, which is 30,333lbs per driving axle. Light wt. of engine was 218,000lbs and tender lt. wt. 82,000. The weight on the pony and trailing trucks would be something over 18,000lbs ea with the boiler full of water. The weight per axle on the tender would be 31,114lbs with a full load of water and fuel oil. Tender capacity is 3500 gal water at 8.33lbs per gal. and 1800 gal fuel oil at an average for bunker c of 7.39lbs gal. I have no idea how these stats compare to a K36 or 37, but I think it is interesting to note that the highest axle loading is not on the engine, but on the tender, which is of course the tenders we have have today behind SVRy 19 and 20. I had not worked out the math before, but a mech. engineer told me that in designing bridges for our current operation in the Sumpter Valley, he figured the highest concentrated bridge loading would be with 19 and 20 coupled tender to tender which makes sense when you look at the axle loading.