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[quote user="timz"] [quote user="timz"][quote user="erikem"]By dropping the tonnage by 5%, the UP got 50% more speed and were less likely to stall on the hill. [/quote]If you're talking about the Wahsatch climb, 5% less tonnage would mean something like 5% more speed.[/quote]Careless thinking on my part. You're right, there could be some combination of speed and tonnage where 5% less tonnage would give 50% more speed-- 9 mph instead of 6 mph, maybe. I still rather doubt that the UP tests were an example of that. [/quote] The tests were against a 3 unit diesel set, but Kratville does not mentioned which one ( the test happened in 1943 - maybe it was a FT ? ), with various loads and fuel assingenments, but in all cases min. speeds were just around 13-16mph. The mentioned 5% less ton. giving 50% more speed are not valid in that case. As it seems, no other test probably ever occoured  in books about BB (or other engines) again, 'though many tests runs at Wasatch and Sherman were performed later. A couple of years ago, I asked UPHS about that, and was granted with a very nice mail and some further explanations. With 4450tons (this was not stall weight!), they would probably run beyond 10mph, so approx. ~20% more tonnage with 50% less speed in comp. 3600tons @ 15mph. Kind Regards lars
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