For those who may have missed it, a few weeks ago Ben Beneke made an interesting post about the pulling power of various locomotives over on Lugnet.trains.
Ben's setup involved a pulley system to measure the pulling power of different locomotives from official LEGO sets, as well as one of his own MOCs. Each locomotive was run on the track type that it was designed for.
Included with Ben's post is a nice chart listing the results, and an even more interesting video (below) of the experiment. The post also generated some good discussion about the pulling power of various trains.
To check out the entire discussion, head on over to http://news.lugnet.com/trains/?n=30971.