They checked on his progress bimonthly.

The sidewalk needed a sweeping every morning.

Sixty minutes divided by the headway gives a potential figure for 'trains per hour' - the simplest possible and most simplistic definition of capacity, termed line capacity.

Amongst the factors peculiar to electric m.u. traction are the heavy unsprung weight of the motors (generally, the greater the weight, the worse is the riding); […].