During 1908 the N.E.R. began introducing a range of corridor carriages for its express services. However, by the eve of the grouping there were less than eighty corridor carriages in service, including full brakes. This was a rather small number considering the size of the N.E.R. but much express passenger traffic along the North Eastern portion of the East Coast Main Line was in the hands of two joint companies, the East Coast Joint Stock Company for Anglo-Scottish services and (from 1906) the Great Northern & North Eastern Joint Stock Company for express passenger services between London Kings Cross and Newcastle.
Between 1912 and 1920 several more were built but to modified designs, particularly the provision of compartment doors. Below, two screenshots of the two-compartment Corridor Brake First.
The Diagram 154 was introduced in June 1908 with No.748 and had doors at the end vestibules. A second example was turned out in March 1910, No. 1950. They were 53ft 6in long and configured for three seats per side, which provided twelve First Class seats. There was a 32ft 5 3/4in long van space for luggage, mail and parcels, which was the equivalent of the company's six-wheel non-corridor Diagram 171 full brake turned out at the same time. When a requirement was identified in 1913 for a further 2-compartment Brake First the NER built a single example of Diagram 200, No.1453. This had external doors to the compartments but retained the end vestibule doors of the Diagram 154.
The Diagram 154 found a use on the company's Leeds to Glasgow set and was probably superseded in the set by the Diagram 200 from October 1913. This service was important to the company since the 8.55 am departure from Leeds enabled businessmen from the North East of England to reach Glasgow at 3.10 pm, allowing several hours of work to be accomplished in the city on the same day as travel. The East Coast Joint Expresses from London for Scotland did not reach York until the afternoon and arrival in Scotland was during the evening. The 4 pm departure from Glasgow in the up direction allowed almost a full day of work in the city prior to returning south.