Two or three of them would grab the strap and pull with all their strength.

My sides are creaky now, but they ache with laughing when I recall how Mulligan used to swear.

Sometimes the strap gave and sometimes the driver' leg was twisted half off.

Was that the origin of the expression 'pulling his leg'?
I wonder! The fare was dropped into the box up in front.

At first the driver was the one who made the change.