The project will see a new second platform and fully-accessible footbridge with lifts added to the East Lothian station.
Work on site will commence in May 2019 with all construction activity due to be completed by early 2020.
The new platform will provide increased capacity and improve operational flexibility as currently all northbound and southbound services have to use the same platform.
Northbound stopping services will use the new platform once it is constructed and it will also allow train companies on the East Coast Main Line to operate more services on the route.
Network Rail will be holding two community drop-ins where residents can come along and find out more about the project and ask any questions direct to the project team.
The first will be held between 16:00 – 19:00 on Wednesday, March 27, in Bleachingfield Community Centre, Countess Crescent, EH42 1DX.
The second between 16:00 – 19:30 on Tuesday, April 2, in Dunbar station waiting room, Station Road, EH42 1JX.
A Network Rail spokesperson said: “The new platform, which will be fully accessible, will mean extra capacity at Dunbar and create opportunities for more services to stop in the future.
“We would like to encourage people to come to this event, where they can find out more about our plans and ask us any questions they may have.”