'The passenger had his head out of the window and shouted abuse to the effect of 'I'll get you this time'.'

She added: "In general there are fewer staff and longer delays, so passengers are getting stressed and shouting at staff."

It all started when a passenger on a Greyhound bus shouted, "There's a bum in the bathroom!"

"Come on," one passenger shouted back, apparently frustrated that a friend could not keep the same pace.

There was much good will and surprisingly little facetious banter; a few younger passengers giggled and shouted "I'm on top of the world."

As these events transpired, other white passengers cursed Tubman and shouted for the conductor to kick her off the train.

The passenger, a man with a large moustache, shouted back, "They like the vibration!"

I heard a man's voice as the passenger shouted something I couldn't understand to the driver as he was pushing open his vehicle door.

A female passenger in the group then shouted "You swore in front of my child" about six times and "It's my birthday" once.