These three vans were supplied by the Swansea Carriage & Wagon Co., Ltd., for the opening of the Manx Northern Railway in 1879 and inherited by the Railway Company upon the merger of 1905, thereafter being allocated new numbers with the "r" prefix in common with other series.  Kr.5 was scrapped as early as 1924, K.6 was fitted with a roof in 1916 and scrapped in 1960, and the last example Kr.7 remained without a roof and was scrapped in 1963.