The Rail and Tourism Group announced The Mainlander passenger train would return to the South after more than two decades.
Chief executive Paul Jackson said it gathered valuable feedback in the 12 hours after launching the service that showed concern about the price point.
"[We] made a decisive change in our pricing to meet that market," he said.
It was done within the first 24 hours of going live and feedback on the change was positive.
The one-way Christchurch to Dunedin trip had a price cut from $199 to $149 and the one-way Dunedin to Invercargill trip went down from $169 to $129.
More than 50% of the tickets were already sold.
The change was also made possible by adding an additional carriage to the train.
"We have been inspired by the positive feedback and will be announcing February dates this month," Mr Jackson said.
Minimal bookings had been made before the price change and refunds were applicable for the difference.
The train would have a capacity of 390 seats once all carriages come through Hillside Workshops, including a generator wagon plus six S-carriages and one buffet carriage.
The inaugural timetable includes Christchurch to Dunedin on January 20, Dunedin to Invercargill on January 21, Invercargill to Dunedin on January 22 and a return service from Dunedin to Christchurch on January 23.
