Well, it works. Here two tows use opposing power to assist each other through railroad bridges (N&W #5) and the Berkley Bridge on the Elizabeth River in Norfolk. Follow the bubble trail behind tug Captain Ron L, the smaller of the two tugs, moving astern.

Tug Aries moves forward. Vulcan Materials Company, a large aggregates company, operates both tugs. From their website, I notice they started out 99 years ago surfacing roads in North Carolina with mules. They also have teacher materials right there. If I were studying high school physics, I’d love this means to understand vectors.

Fancy driving. Fotos thanks to Jed.