Double acting ship

Type of icebreaking ship designed to break heavy ice while going astern

A double acting ship is a type of icebreaking ship designed to travel forwards in open water and thin ice, but turn around and proceed astern (backwards) in heavy ice conditions. In this way, the ship can operate independently in severe ice conditions without icebreaker assistance but retain better open water performance than traditional icebreaking vessels.

This keyword could refer to multiple things. Here are some suggestions: