A rail company is investigating claims one of its trains as so crowded that passengers had to travel in the driver's cab for parts of the journey.
The incident allegedly happened on one of last Saturday's Arriva Trains Wales services.
A spokesman for Arriva Trains Wales told the Guardian: "We are currently investigating an allegation that passengers were travelling in the driver's cab on one of our trains.
"Despite our services being extremely busy over the weekend, passengers would not be allowed to enter and travel in the driver's cab for safety and security reasons. Safety remains our first priority."
The train company added that it was a very busy weekend with its service stretched to its limit.
According to the Telegraph, the statement added: "Over the weekend we ran over 1,300 services across our extensive network.
"On Saturday December 27 and Sunday December 28 Virgin Trains were not running any train services to and from North Wales due to Network Rail's improvement work between Watford and London Euston, which put extra pressure on this part of the network."
The BBC reports the statement continued: "Some of our services were extremely busy however trains are built to robust industry standards recognising that peaks will occur due to the unpredictability of customers' travel patterns and there are no defined upper limits on the number of customers permitted to travel on-board a train.
"While we did everything we could to provide extra capacity, we would like to apologise to customers whose travel plans were inconvenienced last weekend."