Rail Express Systems (R.e.s.) was a British Rail sector responsible for mail and parcels transport.
| Current franchises|
Chiltern | East Anglia (Stansted Express) | East Midlands | Essex Thameside | Greater Western | InterCity East Coast | InterCity West Coast | Merseyrail | New Cross Country | Northern | ScotRail | South Eastern | South Western (Island Line) | Thameslink, Southern and Great Northern (Gatwick Express) | TransPennine | Wales and Borders | West Midlands
Defunct British Rail sectors