Pytchley Road in Kettering will be open again from Saturday, March 1, Network Rail has confirmed.
The firm’s engineers have announced they are on course to complete the re-build of the structure on February 28, as planned.
Route managing director for Network Rail Phil Verster said: “We are aware how disruptive this road closure has been and thank local residents and businesses for their patience while we completed this essential work.
“The re-built bridge will allow electric trains to run underneath as part of our £70m investment to speed up journey times on the line between London and Sheffield.
“It will give the extra headroom needed for trains to travel at higher speeds, when the forces involved mean trains tilt to one side as they pass through curved sections of track.
“We are grateful for the patience from the local authorities and communities have shown us as we near the end of the project.
“We remain focussed on finishing the work quickly as we continue our plans to build a better railway for the East Midlands.”
Road traffic from Kettering town centre and the Carina Road retail park will be able use the Pytchley Road bridge from March 1 when the A6003 (Barton Road) road diversion is lifted.
The bridge has been closed since Monday, December 9, 2013.
Network Rail would normally provide the additional clearance required for faster trains by lowering the track level under the bridge.
However, rebuilding the bridge provides the space needed for trains to travel faster as well as room needed for future installation of overhead line equipment as part of the proposed electrification of the line between Bedford and Sheffield.
The firm says this provides better value for money and minimises disruption.