| Openings Amalgamations Closure | Châtel St.Denis-Palèzieux (CP) | * 04-29-1901 |
| Châtel St.Denis-Vuadens (CBM) | * 07-23-1903 | |
| La Tour-de-Tréme-Montbovon (CBM) | * 07-23-1903 | |
| Vuadens-Bulle (CBM) | * 04-14-1904 | |
| Bulle-La Tour-de-Tréme (CBM) | * 09-21-1904 | |
| Fusion CP+CBM = CEG | 12-20-1907 | |
| Bulle-Les Marches (CEG) | * 01-29-1912 | |
| Les Marches- Broc Fabrique (CEG) | * 06-24-1912 | |
| Fusion CEG+BR+FMA = GFM | 01-01-1942 | |
| Electification | from the beginning | |
| Technical facts | Gauge | 1000 mm |
| Length | 48175 m | |
| Maximum gradient | 3,2 % (Broc-Broc Fabrique 5,0 %) | |
| Minimum radius | 90 m | |
| Power supply | DC 900 V | |
| Bridges | 28 | |
| Tunnel | 2 | |