The only two cattle vans to be purchased from the Ashbury Wagon & Ironworks Co., Ltd., and delivered in 1877, these two vans were delivered open-topped and later modified; they could be identified by their coil springs whereas the Metropolitan Carriage & Wagon Co., Ltd., stock had leaf springs.

K.3 had a roof added in 1924 and was scrapped in 1960, K.4 remained without a roof until the end, being scrapped in 1964, one of the last of the series to survive; drawings do not appear to have survived so it is not known if the planking was diagonal as with K.1 (i) and K.2 (ii) or vertical as with later stock, making the accompanying illustration largely conjectural though the design is likely to have been similar.