During the year to March 2009 Metro ran 96.17 percent of its trains on time - ahead of the performance figures which are set down by the Metro Customer Charter.
And on Monday March 4 Metro punctuality actually peaked at 99 percent, the highest figure on record for a weekday Metro service.
In 2007/08, Metro averaged 95.48 percent punctuality, putting it ahead of all UK rail franchise performance figures, published by the Office of Rail regulation.
The performance figure recorded in Metro’s Customer Charter is for the number of trains that run within three minutes of the timetable – one of the toughest measures in the country.
Metro runs 453 trains and over 17,000km every weekday – more than many train operators and the equivalent to travelling from Newcastle to New Zealand.
Metro Director, Mick Carbro, said: “It has been another outstanding year for Metro punctuality.
“We have stringent performance targets but we have once again managed to exceed those targets set over the last 12 months, providing our customers with an excellent level of service.
“Trains that run on time are the number one priority for our passengers. What we are delivering is nine out of every ten trains on time, a service that is convenient and provides excellent value for money.
“This is down to the tremendous hard work of Metro staff across the organisation, to improve the already very good service we offer passengers.”
Metro punctuality is measured at 17 different points round the 77.5km network, with a train meeting the performance target at each if it arrives within three minutes of its timetable.
This compares to punctuality measured only at the point of arrival on national and regional rail services, where trains must arrive within ten and five minutes of timetable respectively.
In August 2008 the Office of Rail Regulation data showed Metro was ahead of Chiltern Railways (95%) and Merseyrail (94.7%) during 2007-8.
Metro was also ahead of London rail franchises such as Southeastern (90.5%), Southern (89.9%) and South West Trains (92.3%).
Comparison with London Underground is not possible as it uses different measures for punctuality, but in terms of number of trains run Metro, at 99.65% is ahead of any of the London Underground lines.