 In peak hours on quieter lines, the standard Block was supplemented with a Pair; on the busiest routes, a Unit would be attached.As noted in the Tait article, during the Easter and Christmas seasons, the Tait G cars (T-type trailers with gas lighting available as well as electric) would be withdrawn from suburban service and utilised as extra capacity on country trains.Double-block sets of M-T-T-M+M-T-T-M were never used in normal service.