Work began on Monday to install new lifts between the subway and all platforms at Hemel Hempstead and Berkhamsted railway stations.
Work is expected to last until February and the two stations will remain fully open between now and then.
The project is part of the £390m Access for All scheme by Network Rail to create step-free access to entrances and platforms at all railway stations in the UK.
The provision will make it easier for the disabled, elderly and infirm to travel, as well as helping those who are carrying lots of luggage.
Network Rail route managing director Dyan Crowther said: “The improvement works at these stations will make a big difference to passengers. Once completed, the stations will be easier to use and more accessible for everyone.”
The Gazette reported last week about multiple sclerosis sufferer Patrick’s Burke’s difficulty in travelling, as his condition means he is unable to drive.
The 57-year-old, of Cowper Road, Berkhamsted has set up the website www.aid4disabled.com to help disabled people live independently.