A museum was prevented from reopening after a health and safety inspection discovered "hazardous substances risks", according to a heritage organisation.
The Wirral Transport Museum and Tramway was closed on 20 April by Wirral Council following an inspection by the Office of Road and Rail (ORR), which found “significant contraventions of health and safety law” both in the building and in the procedures of how the museum and tramline operated.
Big Heritage, which finalised its takeover of the museum on 17 November from the Wirral Council, said that the closure had been an "inconvenience, but no inconvenience supersedes public safety and the risk to life of visitors and volunteers".
In a statement, Big Heritage said: "We have every sympathy with volunteers and visitors who have been frustrated at this situation.
"But we can attest that Wirral Council took the results of the inspection very seriously and have spent considerable time and resources to address the issues raised as quickly as possible."
The company said procedures had been implemented to monitor and record a range of health and safety and control of hazardous substances risks. It added that a model railway donated 20 years ago has been removed from display as it posed a serious fire risk.
Big Heritage has announced plans to raise over £5m to transform the museum and double its size.
A Wirral Council spokesperson told the BBC: "Ahead of the transfer of the building, there were several issues identified by the council and the ORR report that needed to be addressed and which required the facility to remain closed so the work could be carried out safely.
"The security and upkeep of the building is now in the hands of Big Heritage CIC, while the council-owned heritage trams are on loan to them, with specific contractual requirements around their safety, security and maintenance.
"The council is committed to providing ongoing support to all parties with an interest in the future success of the Wirral Transport Museum."