Gäu District

Oensingen railway station (German: Bahnhof Oensingen) is a railway station in the municipality of Oensingen, in the Swiss canton of Solothurn. The station is a keilbahnhof. It is located at the junction of the standard gauge Jura Foot line of Swiss Federal Railways and Oensingen–Balsthal line of Oensingen-Balsthal-Bahn. It is also a terminus of the 1,000 mm (3 ft 3+3⁄8 in) gauge Langenthal–Oensingen line of Aare Seeland mobil.

Oensingen is a municipality in the district of Gäu in the canton of Solothurn in Switzerland.

Neu Bechburg Castle is a castle in the municipality of Oensingen of the Canton of Solothurn in Switzerland. It is a Swiss heritage site of national significance.

Niederbipp is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland. On 1 January 2020 the former municipality of Wolfisberg merged into Niederbipp.

Niederbipp railway station (German: Bahnhof Niederbipp) is a railway station in the municipality of Niederbipp, in the Swiss canton of Bern. It is an intermediate stop on the standard gauge Jura Foot line of Swiss Federal Railways. It is also located at the junction of the 1,000 mm (3 ft 3+3⁄8 in) gauge Langenthal–Oensingen and Solothurn–Niederbipp lines of Aare Seeland mobil.

Balsthal is a municipality in the district of Thal in the canton of Solothurn in Switzerland.

Thal District is one of the ten districts of the canton of Solothurn in Switzerland, situated in the centre of the canton. Together with the Gäu District, it forms the Amtei (electoral district) of Thal-Gäu. It has a population of 14,752 (as of 31 December 2020).

Neu-Falkenstein Castle is a castle in the municipality of Balsthal of the Canton of Solothurn in Switzerland. It is a Swiss heritage site of national significance.

Kestenholz is a municipality in the district of Gäu in the canton of Solothurn in Switzerland.

Mümliswil-Ramiswil is a municipality in the district of Thal in the canton of Solothurn in Switzerland.

Walliswil bei Niederbipp is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland.

Bannwil railway station (Bahnhof Bannwil) is a railway station on the metre-gauge line Langenthal–Oensingen at Bannwil, canton of Bern, Switzerland. It was opened in 1907 by the Langenthal-Jura-Bahn. The line is currently operated by Aare Seeland mobil (ASM). The original station building with its goods shed is in the architectural inventory of the canton of Bern.