Jiggs thought pulling this boxcar was the most fun he had all day. He was
concerned at first, but then once he figured out the boxcar wasn't going
to eat him, he settled down and trotted through the curve.
We estimate that a modern draft horse like Jiggs can easily pull two or
three boxcars at once, the problem is stopping them...

When the Centerville and the Agnews branch lines were running, they pulled two
or three cars behind much smaller draft horses.