 A total of 32 carriages were eventually built to this type of design.All weighed 26t 10cwt, with capacity for 30 smoking passengers and either 40 or 50 non-smoking passengers.Externally, all carriages were 8’6” wide, and length-wise numbers 1-19 and 24-27D were 59’9” over body, 61’8” over buffers, while 20-23 and 28-32D were 9¾” shorter in both dimensions.