Greytown's Woodside Station will get extra services to make sure there are connections with all weekday off-peak trains and Saturday trains, but Greater Wellington has opted not to add a connection to the late night Friday train.
The late night Friday buses between Martinborough and Featherston will no longer run, though all existing services between Martinborough and Featherston, and Featherston and Masterton will be kept.
Buses between Masterton, Martinborough and Featherston will no longer be provided on Sundays.
Greater Wellington will be putting the SE fleet to use on the Wairarapa line, a set of six carriages which will be refitted with toilets early next year and made available for use on current trains.
Greater Wellington rail operations manager Angus Gabara said the new carriages would not make up another train but would instead add extra capacity to existing services.
He said increasing services had significant cost implications and a review would be undertaken as part of a network-wide review in about 18 months' time.
Greater Wellington councillor for Wairarapa Gary McPhee said the bus services that had been cut were not practicable.
In 2010/11, there was an average of five passengers on every bus trip in Masterton, and an average of seven on Greytown services.
"I've been on a couple of those bus routes and coming back sometimes there's only one or two people on it."
Mr McPhee said it was positive that the routes would now be servicing the Cameron Cres area and Lansdowne village.
"It's good that we keep our finger on the pulse and, whatever is working, great, and if it's not working we'll change it."
He said there would be an opportunity for bus users to give feedback on the changes.
Mr McPhee said it was also positive to see changes to the train services, as it was unacceptable for paying customers to be standing up on any part of the journey. He said he was concerned the new configuration of the carriages might affect the timetable though.