The company was founded as the Seeländische Lokalbahnen in 1912 with its headquarters in Täuffelen. The first section of the line from Nidau to Siselen was opened on 4 December 1916 and the section from Siselen to Ins followed on 19 March 1917. Since the line ends in Ins next to the standard-gauge line of the Bern–Neuchâtel railway, a transporter wagon yard was opened at the same time for the carriage of standard gaugefreight cars on the metre-gauge line. The last section between Nidau and the station forecourt followed on 21 August 1926. A transporter wagon system was opened here, too; wagon could be delivered to any point on the whole line. The Biel–Täuffelen–Ins line remained the only line of the Seeländische Lokalbahnen. The Seeländische Lokalbahnen was renamed the Biel-Täuffelen-Ins-Bahn as of 1 September 1945. The cooperation between the Oberaargau-Jura railway and the Solothurn-Niederbipp Railway, which had existed for some time, was regulated by contract from 1960. The new underground approach of the Biel-Täuffelen-Ins line to Biel/Bienne station was opened on 22 May 1975. This allowed the dismantling of the line that had run along streets under the large SBB railway bridge to Biel station forecourt. The underground station reduced the distance to the Swiss Federal Railways trains and the station forecourt was cleared, allowing it to be rebuilt. An early indication of the later merger was a formal agreement that was contracted on 5 April 1984 between the BTI, the OJB, the SNB, the Oberaargauischen Automobilkurse, the Ligerz-Tessenberg-Bahn and the Bielersee-Schiffahrts-Gesellschaft under the name of Oberaargau-Solothurn-Seeland-Transport . The first of seven low-floor GTW Be 2/6 articulated railcars was put into operation in 1997. The majority of the participants of Oberaargau-Solothurn-Seeland-Transport were merged to form Aare Seeland mobil in 1999. The Ligerz-Tessenberg-Bahn joined only in 2003, while the Bielersee-Schiffahrts-Gesellschaft still remains legally independent.
Route
The line runs largely on its own right of way, although the line runs for a few hundred metres on public roads. The steepest section at 4.7 percent is located between the stations of Ins and Ins Dorf. The BTI ends under Biel SBB station, which is the hub of four SBB lines. The Biel–Grenchen–– and Biel––Yverdon-les-Bains– lines together form the line known as the Jura Foot Railway. The Biel/Bienne–Bern and the Biel/Bienne–La Chaux-de-Fonds lines also connect at the station.
RegioTram planning
There is a Regiotram agglomeration Biel/Bienne project, in which the BTI line would in future be extended as a tram through Biel SBB station and through the city to Bözingenfeld railway station. Thus, the most important development areas of the region would be connected without the need to change trains. With a total length of 27 kilometres, the line would be the longest tram line in Switzerland. The project was stopped by a government enquiry on 26 March 2015.
