 Each was rated for ten passengers, five on each bench, but the width of any given compartment could be anywhere from 5’9¼” to 7’3⅞”, with up to three sizes in any given vehicle.As of 1915 there were 32 carriages destined to later become D type driving trailers.These were AC cars 5, 8, 10, 12, 17, 28, 29, 32, 34, 39, 52, 63, 70 and 139-143; ABC cars 17-20 and BC cars 6-7, 12, 29-30, 32, 36 and 39-41.