Lake Thun railway line

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Lake Thun railway line
Aroponto inter Interlaken kaj Unterseen 255.JPG
Railway bridge over the Aare in Interlaken
Locale Canton of Bern, Switzerland
Termini Thun
Owner BLS AG
Line length 27.9 km (17.3 mi)
Track gauge 1,435 mm (4 ft 8 12 in)
Electrification 15 kV 16 23 Hz AC supplied by overhead line
Route diagram
SBB from Bern–Münsingen, BLS-GTB from Bern–Belp
and BLS-BTB from Burgdorf-Konolfingen
137,02 Thun 560 m above the  sea
km-Wechsel, Eigentumsgrenze SBB/BLS
1,3 Dürrenast 564 m above the  sea
3,1 Gwatt 561 m above the  sea
4,4 Gwattstutz 576 m above the  sea
Kanderbrücke Einigen88 m (li) / 86 m (re)
5,4 Einigen 590 m above the  sea
6,7 Kumm 607 m above the  sea
8,2 Spiezmoos Nord 626 m above the  sea
BLS-SEZ from Zweisimmen
9,7 Spiez 628 m above the  sea
BLS Lötschberg line to Brig
11,8 Faulensee 603 m above the  sea
Krattiggraben143 m
Krattighalde341 m
15,3 Krattighalde 560 m above the  sea
Leissigbad270 m
16,3 Leissigen 570 m above the  sea
22,0 Därligen 562 m above the  sea
Därligen125 m
26,0 Interlaken West 564 m above the  sea
Untere Aarebrücke Interlaken76 m
Obere Aarebrücke Interlaken83 m
27,9 Interlaken Ost 567 m above the  sea
ZB Brünig line to Lucerne and
BOB to Grindelwald and Lauterbrunnen
Werkstätte Bönigen 567 m above the  sea
Bridge over the Lütschine? m
30,4 Lütschinenbrücke
31,0 Bönigen
Historic BLS locomotive at Därligen
Thun railway station

The Lake Thun railway line is a railway line in the Swiss canton of Bern. It links the towns of Thun, Spiez and Interlaken, running principally along the southern shore of Lake Thun. The line was opened in 1893 by the Lake Thun Railway (German: Thunerseebahn, TSB) company, but incorporates much of the earlier Bödeli Railway (German: Bödelibahn) dating back to 1872.

The line is 27.9-kilometre (17.3 mi) long, and is currently owned and operated by the BLS AG railway company. Besides traffic to and from Interlaken, the section of line between Thun and Spiez also carries heavy traffic to and from the Lötschberg line.


The history of the Lake Thun line is linked to that of the shipping services on Lake Thun and Lake Brienz, which date back to at least 1834, when the first steamship was introduced. The two lakes are linked by a 5.5 km (3.4 mi) stretch of the Aare through Interlaken, but the river is not navigable, dropping some 6 metres (20 ft) and passing over several weirs.[1]

In 1872, the first part of the Bödeli Railway was built, from Därligen, on Lake Thun, to what is now Interlaken West station. In 1874, it was extended, via what is now Interlaken Ost station, to Bönigen, on Lake Brienz. The line was not connected to any other railway, and served to connect the shipping on the two lakes to each other, and to Interlaken. The route of the Bödeli Railway crosses the Aare twice, using bridges with little headroom beneath them, and it has been suggested that this was done deliberately in order to dissuade attempts to canalise the river and thus maintain the railway's role.[1][2]

From 1873, the Bödeli Railway also operated a train ferry on Lake Thun, providing a connection for freight to the Bern–Thun railway line at Thun. In 1890, the Lake Thun Railway company obtained a concession for a railway from Scherzligen in Thun, via Spiez, to an end-on connection with the existing Bödeli Railway at Därligen. This line started operation in 1893, and also leased the Bödeli Railway between Därligen and Interlaken Ost. The Bödeli Railway was fully incorporated into the Lake Thun Railway company in 1900.

In 1901, the Spiez to Frutigen line was opened, which was to become the first stage of the Lötschberg line, carrying heavy traffic across the Alps, and transforming the stretch of the Lake Thun line between Thun and Spiez. In 1913, the Lake Thun Railway company was taken over by the Bern-Lötschberg-Simplon Railway, which became today's BLS AG.[1]

Bönigen remained the eastern terminus of the line until 1969, when passenger service was cut back to Interlaken Ost station. However the BLS had built its main workshops alongside the line at Bönigen's western edge, and these remain open, along with the track between Interlaken and the workshops. The rest of line was removed, although the site of the lakeside terminus can still be identified.[3]

Route and infrastructure[edit]

The 27.9-kilometre (17.3 mi) long Lake Thun line commences at Thun station, where it makes an end on junction with the Swiss Federal Railways owned Bern to Thun main line, and two other lines owned by the BLS AG; the Gürbetal line from Bern via Belp and the Burgdorf to Thun line from Burgdorf via Konolfingen.

Near the intermediate Spiez station, the Lake Thun line has junctions with two further lines owned by the BLS AG; the Spiez–Erlenbach–Zweisimmen line from Zweisimmen and the Lötschberg line to Brig.

The line terminates just to the east of Interlaken Ost station, where it connects with the metre gauge Brünig line, which operates to Lucerne and is owned by the Zentralbahn, and the Berner Oberland-Bahnen, which operates to Grindelwald and Lauterbrunnen.

The Lake Thun line is built to standard gauge and is electrified using the Swiss mainline standard of 15 kV 16 23 Hz AC supplied by overhead line. Between Thun and Spiez the line is double-tracked; from Spiez to Interlaken it is single track with passing loops. Besides traffic to and from Interlaken, the section of line between Thun and Spiez also carries heavy traffic to and from the Lötschberg line.


  1. ^ a b c "History of navigation on Lakes Thun and Brienz". BLS AG. Retrieved 2012-12-13. 
  2. ^ "The Bödeli Railway". Jungfraubahnen. Archived from the original on 2008-12-16. Retrieved 2008-01-24. 
  3. ^ "Interlaken Ost–Bönigen". (in German). Retrieved 2012-09-26.