Virgin Trains service from Birmingham to London failed to meet punctuality targets of 90 per cent, figures have shown.
Punctuality on all trains increased last month to a new record high for any May, with 93.6% of trains running on time in May 2010 compared with 93.4% in May last year.
But Virgin West Coast only ran 89 per cent of its trains on time, with another company East Coast running just 88.8 per cent of trains on time.
In the case of East Coast, services were affected by two deaths, two cable thefts and a broken-down train, while Virgin’s figure was an improvement on May 2009 when it ran only 84.6 per cent of trains on time.
Best-performing company last month was Merseyrail, which ran 96.8 per cent of trains on time.
Network Rail’s operations and customer services director Robin Gisby said: “Passengers across the network are reaping the real benefits of a high-performing, punctual railway - the aspect of the rail service that passengers rate as the single most important.
“We are far from complacent, and we and train operators will continue to work tirelessly to boost train punctuality to even higher levels.”