The internet is going bonkers over this practically impossible puzzle

omg 19/03/2018

Nothing gets the brain ticking first thing on a Monday more than a headache-inducing train puzzle.

The puzzle shows a series of trains heading to their destinations, but one is going in the opposite direction to the others - and it has us completely stumped trying to work out which.

Among the different coloured trains, can you spot which one is going the wrong way?

Photo credit: Heathrow Express