Y6 was a series of diesel railcars operated by Statens Järnvägar (SJ) of Sweden.

378 motor cars and 321 trailers were delivered between 1953-61 by Hägglund & Söner, Svenska Järnvägsverkstäderna, Kalmar Mekaniska Verkstad and Eksjöverken.

In 1981 five units were sold from SJ to the Norwegian State Railways, where they were designated NSB Class 89 and used on the Flekkefjord Line.

It has smaller and simpler seats, with five-abreast, totalling 53 places.

At first NSB borrowed two Y7 units from SJ, which arrived to Norway on 23 January 1981 and were put into service on 24 February.

They proved reliable and suitable, and NSB purchased them for SEK 95,000 each plus freight in April.

They retained the SJ colour scheme, but received the NSB logo.

They received a white paint job but the private operations were never realized.