Liverpool Metro Mayor Steve Rotherham is calling for an inquiry after adverse weather caused the cancellation of Merseyrail services of Friday.
The organisation announced on Thursday evening that it would not run trains on Friday or provide rail replacement due to expected weather conditions.
Mr Rotheram tweeted: “This afternoon I have met with Network Rail and Merseyrail to convey that I believe the situation this morning was unacceptable for our city region.
“I have also written to Network Rail asking for a formal inquiry to learn lessons and to try and prevent this from happening again.”
Network Rail’s North West route director Phil James said: “With freezing weather forecast to worsen overnight the risk of trains losing power and becoming stranded due to ice on the electric rail was very high,”
He suggested that empty test trains had lost power on the routes late on Thursday evening.
A Merseyrail spokesperson said they would “fully review the circumstances surrounding the service disruption caused by adverse weather, ensuring any lessons learnt are identified.”