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); […].

The sidewalk needed a sweeping every morning.

They checked on his progress bimonthly.

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.