F Liner
| The F Liner Logo (Top) Tobu 9000 series train on an F Liner service (Bottom) | |
| Overview | |
|---|---|
| Status | Operational | 
| Locale | Tokyo, Kanagawa Prefecture, Saitama Prefecture | 
| First service | 26 March 2016 | 
| Current operator(s) | |
| Route | |
| Termini | 
 Motomachi-Chūkagai | 
| Line(s) used | 
 | 
| Technical | |
| Rolling stock | See § Rolling stock | 
| Track gauge | 1,067 mm (3 ft 6 in) | 
| Electrification | 1,500 V DC overhead | 
F Liner (Fライナー, Efu Rainā) is the name for the fastest through service train among five railway companies: the Tobu Railway, Seibu Railway, Tokyo Metro, Tokyu Corporation and Yokohama Minatomirai Railway.
This name is trademarked by the aforementioned five companies (No. 5885630).