| Unit Number | Current Status | Formation | Videos | Images | |
|---|---|---|---|---|---|
| 171 201 | Reformed, 56421 from 171 401 added | 2 Car | 50421 79421 | Anerley Anerley | Operational | 3 Car | 50421 56421 79421 |
| 171 202 | Converted back to part of 170 423 | 2 Car | 50423 79423 | Ashford Intl Nutfield Upper Warlingham Uckfield Ashurst East Croydon | |
| 171 401 | Converted back to part of 171 201 and all of 170 422 | 4 Car | 50422 56421 56422 79422 | Redhill Ore Bexhill Normans Bay Collington Collington Pevensey & Westham Pevensey & Westham East Croydon | |
| 171 402 | Converted back to part of 170 423 and all of 170 424 | 4 Car | 50424 56423 56424 79424 | East Croydon Upper Warlingham | |
| 171 721 | Reformed to part of 171 807 | 2 Car | 50721 79721 | Brighton Ashford Intl Three Oaks Upper Warlingham Anerley Anerley | Eridge |
| 171 722 | Reformed to part of 171 808 | 2 Car | 50722 79722 | East Croydon Riddlesdown Buxted Oxted Edenbridge Town Hurst Green Hurst Green Hever East Croydon | |
| 171 723 | Reformed to part of 171 809 | 2 Car | 50723 79723 | Brighton East Croydon Doleham Upper Warlingham | |
| 171 724 | Reformed to part of 171 810 | 2 Car | 50724 79724 | Hampden Park East Croydon Uckfield | |
| 171 725 | Reformed to part of 171 811 | 2 Car | 50725 79725 | Brockley Ashford Intl Buxted Oxted | |
| 171 726 | Reformed to part of 171 812 | 2 Car | 50726 79726 | Uckfield Ashurst | |
| 171 727 | Operational | 2 Car | 50727 79727 | London Bridge Crowborough Ashurst | London Bridge (C) London Bridge (C) |
| 171 728 | Operational | 2 Car | 50728 79728 | Brighton Buxted Oxted Hurst Green Uckfield Cowden Hever Oxted | |
| 171 729 | Operational | 2 Car | 50729 79729 | East Croydon Crowborough Cowden Ashurst | |
| 171 730 | Operational | 2 Car | 50392 79392 | Upper Warlingham Crowborough Ashurst | |
| 171 801 | Operational | 3 Car | 50801 54801 79801 | Reformed, 56801 removed and added to 171 812 | 4 Car | 50801 54801 56801 79801 | East Croydon Ore Bexhill Cooden Beach Normans Bay Normans Bay Eastbourne Hastings |
| 171 802 | Operational | 3 Car | 50802 54802 79802 | Rye | Reformed, 56802 removed and added to 171 809 | 4 Car | 50802 54802 56802 79802 | Eridge Salfords Riddlesdown Three Bridges |
| 171 803 | Operational | 3 Car | 50803 54803 79803 | Reformed, 56803 removed and added to 171 811 | 4 Car | 50803 54803 56803 79803 | Salfords Cooden Beach Cooden Beach Collington Eastbourne Pevensey & Westham Uckfield Ashurst | Salfords |
| 171 804 | Operational | 3 Car | 50804 54804 79804 | Pevensey Bay | Reformed, 56804 removed and added to 171 808 | 4 Car | 50804 54804 56804 79804 | Eridge Ashford Intl Uckfield |
| 171 805 | Operational | 3 Car | 50805 54805 79805 | Appledore Ham Street Rye East Croydon | Reformed, 56805 removed and added to 171 810 | 4 Car | 50805 54805 56805 79805 | Norwood Junction Edenbridge Town Hastings |
| 171 806 | Operational | 3 Car | 50806 54806 79806 | Appledore Rye | Reformed, 56806 removed and added to 171 807 | 4 Car | 50806 54806 56806 79806 | Salfords | London Bridge (C) London Bridge (C) |
| 171 807 | Operational | 3 Car | 50721 56806 79721 | ||
| 171 808 | Operational | 3 Car | 50722 56804 79722 | ||
| 171 809 | Operational | 3 Car | 50723 56802 79723 | ||
| 171 810 | Operational | 3 Car | 50724 56805 79724 | Eridge | |
| 171 811 | Operational | 3 Car | 50725 56803 79725 | Pevensey Bay Eridge | |
| 171 812 | Operational | 3 Car | 50726 56801 79726 |