A total of 650 of these 50ft long coaches, in various configurations, were built at Wolverton Works between 1891 and 1903 by the London and North Western Railway for main line services. The term 'arc roof' refers to the uniform curve of the roof whilst other coaches had ellpsoid roofs. Our kits represent four types of these coaches. The all 3rd was the most numerous type of corridor vehicle operated by LMs, whilst the brake coaches vary from the norm by having their guard's and luggage compartments in the centre of the coach. The LMs ran them until nationalisation, after which a few survived into BR departmental use. All 3rd.