The class 155 DMU were constructed and put into serice between 1987 and 1988 by British Leyland ar Working. Regional Railways had 35 of these units built. (155301-155335) These units had some problems when in service. The doors would randomly open whilst the train was moving. Modifacations were made so this would not happen. In 1988, WYPTE had 7 units build with the modifacations already done before they were put into service. These units were numbered 155341-155347. In 1991, the class 155s owned by Regional Railways were being withdrawn from service, not for scrapping, but to be rebuilt into single car class 153s. These were built to replace the old class 120/121 bubble car railcars. There are only 7 class 155s left, they are the second batch as WYPTE didn't want their class 155s as single car units. In 2006, the remaining 7 were refurbished. The parcel compartment was converted into a bike rack, the seating was replaced, the whole interior was 'freshened up', and the exterior was repainted from WYPTE Red and Cream, to Northern Rail Purple, white and blue.