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I'm trying to figure out relative strengths of steam vs diesel. It's getting harder for me to compare the two. Seems that GE and EMD market their locomotives based on horsepower. Then I look at old steam locomotives and I hear words like "developed x pounds of traction effort at the drawbar at 35 miles per hour." Sooooo.... What horsepower is, say, the UP Big Boy rated at? Does horsepower have any effect on size of trains? Are trains bigger now than they were? And, completely off subject, what exactly is the definition of "track capacity"? My gut reaction is that one train occupying track means that the track is "at capacity". Two trains occupying the same space would be a bad thing- the track would be "over capacity". I read about UP exceeding "track capacity".... Erik
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