All these tugboats have a common design feature.  I’ll let you figure it out. 

Eastern Dawn pushed a load of scrap westbound in the Kills.

James William showed off her bow as she traveled light toward the Upper Bay.

 

Ditto Buchanan 12, usually confined to pushing up and down the Hudson with a train of rock scows.

 

Robert IV does a plethora of jobs, spot work I think it would be called, from her base at Caddell’s.

Eastern Dawn returns from Newark Bay with a light scow.

 

And finally . . . where’s the tug pushing this deck barge with a boring machine?

It’s the shorty but mighty Jimmy!

And what they have in common is the squared off versus model bow, with knees designed for pushing.

All photos and any errors, WVD.