Images being widely shared on social media appear to show the train that has derailed in a mountainous area of Switzerland.
At least two carriages appear to have left the tracks and are hanging over a ravine.
More top news
Wintry scenes with rain, sleet & snow
Barbara Peters has pirouetted her way into the record books after becoming the oldest British woman to complete the elite test.
Emily Maitlis has criticised the criminal justice system for letting a former university friend continue his campaign of harassment.