Following the nationalisation of transport in 1948, the british transport commission set up its own in house film production unit'. '.strtoupper('l')aunched on 1 may 1949, and led for 25 years by edgar anstey a founding father of the british documentary movement it became one of the largest industrial film units in britain.the fourth volume in this series of 6 disc box sets presents a selection of films produced by btf for london transport in the post war period, including the construction of the victoria line'. '.strtoupper('i')t also contains previously unreleased films on the new services offered by british transport during the same period, such as the future works and partners in prosperity.this digitally remastered collection is a must for the transport enthusiast and the documentary aficionado alike'. '.strtoupper('i')t includes a fully illustrated booklet with extensive film notes by bfi curators, and full credits.extras episode list32 short films over six dvds