| Name: | Unnamed Caisson |
| Type: | Caisson |
| Launched: | 1863 |
| Completed: | 1863 |
| Builder: | Andrew Leslie & Co |
| Yard: | Hebburn |
| Yard Number: | 48 |
| Dimensions: | |
| Engines: | None |
| Engines by: | n/a |
| Propulsion: | None |
| Construction: | Iron |
| Reg Number: | n/a |
| History: | |
| 1863 | Unknown Tyne repair yard |
| No later history known | |
| Comments: | One of a pair built for this yard. See also YN 49 |