The earliest "railways" were straight and were constructed from parallel rails of timber on which ran horse-drawn carts.

H8 - An octocopter that uses two parallel rails, each containing four rotors, attached to the core at multiple points.

While arranging the powder in four parallel rails, he explained that Michael the Mechanic, our drug dealer, had been out of cocaine.

A large wooden beam, reinforced with sheet metal, was stored across the top of the tank on a set of parallel rails.

It uses a pair of parallel rails and several slots perpendicular to these rails.

Most saddles have two parallel rails that the seatpost clamps to.

At this time, new double parallel rails of 78 lb.

A Monorail is a metro with a track consisting of a single rail, as opposed to the traditional track with two parallel rails.

Behind it were deposited parallel rails of welded steel.

The railroad gate went flying by and then Midnight was sailing over the parallel rails that had been the downfall of the first competitor.