revision preference src: A Sentinel steam railcar was introduced on the line in 1929 as an attempt to reduce the cost of passenger train operation, but passenger use was light and passenger services on the branch were withdrawn on 31 May 1932. <SEP> tgt: A Sentinel steam railcar was introduced on the line in 1929 as an attempt to reduce the cost of passenger train operation. Passenger use was light and passenger services on the branch were withdrawn on 31 May 1932.