The LMS did not make great use of articulated sets, largely due to the disparate needs of the operating divisions, some of which had rather severe weight restrictions. Three types were introduced which were assembled as three different pairings. These sides can be used for either the TO+TO to D1966 or the TO+CO to D1967, which were externally identical. The other pairing for the BTO+TO to D1965 is available as COMET MODELS sides pack M65S or full kit M65K. They were useful coaches which operated in high density and excursion traffic as well as express passenger workings. Their appearance was distinctive not only by their being articulated but also because they rode on centrally trussed underframes. All were built at Derby.