'Materieel 1954' (Hondekop) was developed to replace the old Materieel '24. In the autumn of 1956 the first multiple units were delivered in the dark green livery with red piping. From 1962 the Hondekoppen were repainted with yellow piping and a yellow moustache. In the context of Spoorslag '70 major changes are made to the appearance of the trains. From 1968 the first Hondekop appears in the new bright yellow livery. From 1970 the trainsets are equipped with the characteristic sloping blue banners to accommodate advertising and a third headlight on the front.