Changes

In the early 1960s several Several carriages were modified and formed into rakes as mobile control trains for use in the event of war. From the 1950s war planning included moving district control offices and the The Ministry of Transport specified mobile controls. Each of the then six Regions provided two trains.<ref>[http://www.lnerca.org/home/wp-content/uploads/2016/03/Hush-Hush-Coaches.pdf] (Retrieved 1 February 2017)</ref> As a result carriages survived that might otherwise have been scrapped, and found there way into preservation.