Between 1935 and 1937,
Clyde Engineering built 35 first class BS carriages with 42 seats and 86 second class FS
side corridor carriages with 64 seats at its
Granville factory. Over the years, they operated on services from express passenger and mail trains to branch line services. Withdrawals commenced in the 1970s but some lasted until the late 1980s on mail trains to
Dubbo,
Moree and
Tenterfield and Interurban services to
Newcastle,
Bathurst,
Goulburn and
Bomaderry. During the period spanning 1974 to 1982, eight were gutted internally and fitted with suburban throw over seating and Beclawat windows for use on interurban services. These received the IFS and MFS classifications. As of June 1986, 32 remained in service with the
State Rail Authority. ==Surviving S type cars==