Four cars were built in 1909 and six cars in 1910. They were coded ESBV (E-Mail, S-Sorting, B-2nd Class, V-vestibule). The cars were numbered 1 - 10. In the 1910 recoding they were reclassed to BDSE with the same numbers. A reference in a Newsrail article of 1996 aludes to the codes being unknown for vehicles built in 1910. There is no basis for this as the Registers clearly show their class as issued to service. The 1910 recoding took place from July 1910;the ESBV vehicles codes were issued prior to June.
The carriages were 70' long with Second Class accommodation at one end with a mail sorting van at the other.
They were introduced in conjunction with the postal department. Many small towns had limited postal staff. Sorting on the train by travelling postal staff assisted the local workload. By 1932 many of the town were large enough to support more staff and mail sorting ceased. The vans were placed into storage for several years.
Three vans were modified and recoded to _BE_ in 1922/1923 with two more conversions done in 1929.
The remaining five cars were placed in storage 1933/34.
In 1935 they were modified to a Car/Van configuration and reclassed to BCE_, numbers 1 - 5.