The Scottish Region (ScR) inherited sites from both the LMS and the LNER, it had up to 47 coaches available from 1952 to 1969. The coaches were converted in batches, the first batch of 10 conversions, done at St Rollox in 1952, being similar to LMR conversions made on former LNWR stock of 1906 to 1915 vintage. Most of the remaining conversions, done between 1953 and 1957 were mostly made to former Caledonian Railway stock, there were a few conversions of shorter coaches.