I've never been a big fan of the TRACKMOBILE, as small industries are operated them in favor of the little GE/Plymouth critters that they have replaced. It was a major suprise to me, when I saw CP, a major Class I RR, operate at least two of them here in Saskatoon. Now I would understand if they were power short, but at any given time there's at least two GP9u-GP9u sets in the yard (East yard+West yard switcher), plus if more power is needed, an extra GP9u is added for trio Geep power, not to mention GP38-2/SD40-2 wayfreight power who do their own switcing...
Either way, this guy mostly works near the car wash facility where he pulls & pushes up to six hoppers at a time, than drives off onto the road to rest nearby. Based on what I've seen, this appears to be a daily job for the unit. Here's a photo of him resting nearby:
http://www.railroadforums.com/photos/showphoto.php/photo/41604/si/9044