| Class Y8400 | |
| Powertype: | Diesel |
| Builder: |  Arbel Fauvet Rail |
| Builddate: | 1990–1995 |
| Totalproduction: | 150 |
| Whytetype: | 0-4-0 |
| Uicclass: | B |
| Length: | 10.14m (33.27feet) |
| Locoweight: | 36t |
| Fueltype: | Diesel |
| Primemover: | Poyaud V12 |
| Enginetype: | V12 Diesel |
| Transmission: | Hydraulic |
| Maxspeed: | 60km/h |
| Poweroutput: | 205kW |
| Operator: | SNCF |
| Operatorclass: | Y8400 |
| Numinclass: | 150 (at 2005) |
| Fleetnumbers: | Y8401–Y8550 |
This class of small shunters has 150 members. They were delivered by Arbel Fauvet Rail in the early 1990s and seem to have been spread across France. They have the 0-4-0 ("B") wheel arrangement, 200 kW diesel engines and hydraulic transmission.