39-188 BR MK1 BG Full Brake Network SouthEast Coach No.92354BR MK1 BG Full Brake Network SouthEast Coach BR Mark 1 coaching stock was the first standardised design of railway carriages built by British Railways (BR) post nationalisation in 1948, the family of locomotive hauled passenger coaches being constructed from 1951 until 1963 to augment and replace the array of Big Four and earlier pre grouping designs inherited from the LMS, LNER, GWR and SR. Non passenger carrying Mk1s and multiple units based on the