Double-ended

This double-ended arrow appears to point in two directions.

We created a computer version of the card game using a double-ended queue.

Now it consists of a large double-ended straight shed, divided across the middle by workshops and offices; one end is concerned solely with steam locomotives and the other with diesel locomotives and railcars.

British locomotives, like most European ones, are double-ended, general purpose machines, intended to be suitable for a variety of duties, and on occasion to work in multiple with each other.