The Department of Infrastructure says it's investigating after a tram's brake failed on Snaefell.
The incident happened on Friday, while passengers were on board - the tram ran backwards 200 yards before mechanical brakes kicked in.
The DOI says it's now working with the Island's Health and Safety at Work Inspectorate.
In a statement, the department says the matter is being treated very seriously and it's committed to ensuring the safety of passengers and crews.
It adds it won't be commenting further while the investigation continues.
Illegal immigrant turned back at Manx border can't stay in UK
Bank scammers warning as calls target Island residents
Island to extend UK VAT cut on power, says Treasury Minister
Woman thanks mystery van driver after daring sea rescue
Stay off damaged slipway in Laxey, says local authority
MHK sues attorney general and returning officer over election votes
Islanders reminded to keep challenging domestic abuse beyond October
