In Trial by Trolley, one player acts as the Trolley Operator and must choose where to send a murderous, out of control, trolley. Every other player at the table plays cards and argues in order to convince the operator to spare their lives and condemn everyone on the other track to a gruesome death-by-trolley.
Each round, one player will act as the trolley conductor. This person will be the judge, and will choose which track the trolley will murder.
The judge will ponder this conundrum, and eventually decide to murder one track. The track that was spared is the winner for the round!