When reviews of all of New Zealand's branch railways were conducted in 1930 and 1952, the Kingston route was considered a mainline and therefore not assessed. After a railcar service was briefly considered in the 1930s, regular passenger services were cancelled, though seasonal excursions and holiday trains ran for another two decades. The last one ran in Easter 1957, and passenger trains were a very rare sight on the Kingston line in the 1960s. Not long before the seasonal excursions ended, so did another service: the Friday mixed train between Invercargill and Lumsden ceased running in November 1956. The line then settled into a pattern of daily freight trains from Lumsden to Invercargill and return, augmented by a twice-weekly service onwards to Kingston.