Pattern 1 Notes:
In 1925, the SR placed orders for new carriages for West of England and Central Section services to London which incorporated these 'standard' features. The body (which was in essence a 'bow-ended' design with a basic length of 59' along the coach centreline) included passenger compartments each with an external door and corridors with 'low' main window lights. The windows were fitted into a wooden frame arranged such that the glass was noticeably recessed into the body side. The maximum width over the body sheeting was 9' 0" (Route Restriction 4) and there was a marked tumblehome. The luggage and guard's compartments had vertical sides (8' 7" wide with a small tumblehome at the base) and steel duckets.

Pattern 2 Notes:
The first or 'low' pattern of Maunsell bodyside, remained in production until 1933 for certain types of carriage but in 1929, the second pattern (known as pattern 2) which featured 'HIGH' corridor window lights emerged and since this was the only significant change, there was no need for a change in diagram number.

Pattern 3 Notes:
The next major change in design occurred in 1935 (pattern 3). Windows were virtually flush with the window sides (the larger lights having large radius corners), and the body was marked by numerous screw heads where the steel sheeting was fixed to the wooden framing. Droplights were frameless. The gutter appeared more slender, adding to the 'flush sided' appearance. The 'double' battery boxes were dispensed with and two single boxes, each offset to the left of the coach centreline when viewed on each side.

Pattern 4 Notes: The final pattern (pattern 4) appeared in 1936, with the fixed window lights (small radius corners) mounted in a neat frame, giving the appearance of a moulding on the body side. Droplights were frameless except on the Open Third design where frames were again used. The numerous screw heads disappeared, presenting what was possibly the most attractive of Maunsell's carriage designs. N.B. There were no pattern 4 coaches in the North Cornwall line sets.