A head on collision involving two commuter trains in Switzerland has resulted in the injury of 44 people. The collision occurred between the cities of Moudon and Payerne at about 6:50 p.m. local time, reports said. It is unclear at this point what caused the collision to occur. "We don't know why this crash happened," Swiss Federal Railways spokesman Reto Schaerli told CNN. "There is currently no train service between these two cities until midnight tonight at least."