Maintenance Depot in Leeds. Northern Rail is the country's largest train operating company, with more than 2,500 services every weekday calling at 529 stations in the north west, north east and Yorkshire & Humberside regions.

Northern Rail area director Malcolm Brown said: "Our partnership with Metro has enabled us to deliver real improvements on these trains, creating a much more passenger-friendly and comfortable environment."

The West Yorkshire Passenger Transport Authority chairman, Bradford's Councillor Stanley King, said: "Metro is committed to making public transport an attractive choice and these refurbishment programmes are good examples of the way we work with our partners to deliver real benefits for passengers, encouraging growth in passenger numbers and at the same time relieving congestion."