The government paused the electrification of the Midland Mainline north of Bedford and through Northamptonshire in June but has announced that the work will now resume.
The works will result in faster rail journeys from Bedford to Sheffield, which cover Wellingborough and Kettering.
Wellingborough Chamber of Commerce president David Cross (pictured) said: “Finally, common sense has prevailed. This is good news for Wellingborough, good news for our people and good news for the local business community.
Secretary of State for Transport Patrick McLoughlin said: “As a one nation government, we are making sure every part of Britain benefits from a growing economy.”