The Wairarapa Connection is a New Zealand interurban commuter rail service along the Wairarapa Line between Masterton, the largest town in the Wairarapa, and Wellington. It is operated by Wellington suburban operator Transdev (with KiwiRail sub-contracted to operate the locomotives) under contract from the Greater Wellington Regional Council. It is a diesel-hauled carriage service, introduced by the New Zealand Railways Department in 1964 after passenger demand between Masterton to Wellington exceeded the capacity of the diesel railcars then used.