London Midland is offering return fares to the capital for as little as £5 for over-55s during September and October.
Special deals have been launched along the West Coast Mainline at stations including Milton Keynes, Northampton, Leighton Buzzard and Watford Junction until October 23.
Over-55s can take advantage of the deals travelling at any time on weekends.
Travel on weekdays is after 10am and there are restrictions on return travel during the evening peak.
For further information and vouchers to take part in the over-55s deal visit your nearest London Midland station or www.londonmidland.com/55