7P-001-102 BR SR Green MK1 SO Coach No. S3824The British Railways Mark 1 passenger coach was designed and constructed in the early 1950s and were designed to standardise rolling stock across the four major railway companies (GWR, SR, LMS and LNER) whilst keeping the characteristics of the dedicated regions. The coaches were fitted with overhead luggage racks and both electric and steam heating for additional passenger comfort. The MK1s were built in many different designs which incorporated