South Western Railway has started work on a £100 million upgrade of its trains, the biggest ever of its kind.
The work is being carried out in Eastleigh and will create more than 200 jobs.
It is a major boost to the towns railway works which once employed 10,000 people.
Along with completely refurbished trains, South Western Railway say the engineering work will address reliability issues that cause trains to break down leading to major disruption.
Our Transport Correspondent Mike Pearse spoke Neil Drury from South Western Railway