Erlen, Thurgau Canton, Switzerland
Circuit Type: Temporary street circuit
Original Layout
Extension: 2,800 Km
Lap Record: 1:31.600
Year: 1948
Driver: Toulo de Graffenried
Car: Maserati 4CL
Speed: 110,043 Km/h
Pole Record: 1:26.800
Year: 1948
Driver: Toulo de Graffenried
Car: Maserati 4CL
Speed: 116,129 Km/h
| Year | Official Name | Date | Winning Driver | Constructor | Laps | Time | Formula |
|---|---|---|---|---|---|---|---|
| 1949 | II Grosser Preis der Ostschweiz | May 22 |  Emmanuel de Graffenried |
 Maserati |
50 |
01:19:29.800 | GP |
| 1948 | I Grosser Preis der Ostschweiz | August 8 | Emmanuel de Graffenried |
Maserati |
50 |
01:22:14.800 | GP |