Automobiles, trucks, ships, and trains are all required by law in some countries to have horns.

The train was sent out of operation and required an overhaul.

The northbound platform is only used when trains are required to pass at the station.

Most uphill trains were required to double and triple the grade.

If a train is required in service again within too short a period, the tanks may not get emptied.

Sixty trains were required to bring them to the rear during the week after the battle.

Furthermore, the train is required to slow down at level crossings which increases travel time.

A 2012 report by Network Rail stated that more trains on the line would be required to make the station viable.

It was decided to proceed with the repairs as the trains are required under a new timetable introduced in November 2008.

And, should new trains be required, we stand ready, willing and able to pay our full share of their cost.