Appenzell–St. Gallen–Trogen railway

The Appenzell–St. Gallen–Trogen railway, also known as the Durchmesserlinie (diameter line), is a metre gauge overland tramway in the Swiss cantons of Appenzell Innerrhoden and Ausserrhoden and the city of St. Gallen. It is the steepest adhesion railway in Switzerland with a gradient of up to 8.0% and forms part of the network of the Appenzell Railways (AB) and the St. Gallen S-Bahn (S20, S21 and S22 services). The line's two branches were completed in sections between 1889 and 1904 by the St. Gallen-Gais-Appenzell-Altstätten Railway and the Trogen Railway. The two lines were connected by the AB with a cross-city route in 2018.

Appenzell–St. Gallen–Trogen railway
ABe 8/12 between Schülerhaus and Notkersegg, St. Gallen behind
Overview
Line number855
LocaleSwitzerland
Termini
Technical
Line length29.72 km (18.47 mi)
Track gauge1,000 mm (3 ft 3+3⁄8 in)
Minimum radius25 metres (82 ft)
Electrification
  • Appenzell–St. Gallen: 1500 V DC
  • St. Gallen–Schülerhaus: 600 V DC
  • Schülerhaus–Trogen: 1500 V DC
  • Overhead lines
Maximum incline8.0%
Route map
km
elev
S23 AB from Gossau
20.06
 Appenzell
S20 S21 S23
785.6 m
S23 AB to Wasserauen
Sitter Viaduct (296 m)
Hirschberg (64 m)
18.40
 Hirschberg
819.9 m
16.12
 Sammelplatz
high point
928.2 m
Appenzell Innerrhoden
Appenzell Ausserrhoden
depot and workshop
AB from Altstätten
13.91
 Gais
S24
915.2 m
13.37
 Zweibrücken
907.2 m
 Eggli
(planned)
12.05
 Strahlholz
875.0 m
10.63
 Bühler
824.7 m
9.25
 Steigbach
811.7 m
Goldibach (94 m)
7.16
 Teufen
S22
833.4 m
6.32
 Stofel
836.2 m
5.77
 Sternen bei Teufen
831.2 m
5.15
 Niederteufen
830.7 m
3.86
 Lustmühle
770.7 m
chainage adjustment -0.14
(since 2018)
Appenzell Ausserrhoden
St. Gallen
Liebegg
740.3 m
2.22
 St. Gallen Riethüsli
until 2018
748.6 m
2.01
 St. Gallen Riethüsli
since 2018
2.0  
beginning of rack section (until 2018)
Ruckhalde Tunnel (since 2018) 725 m
1.0  
end of rack section (until 2018)
SBB from Winterthur and
SOB from Wattwil
St. Gallen freight yard
(from late 2022)
new route (from the end of 2022)
St. Leonards bridge
access to St. Gallen SGA (until 2018)
crossover (since 2018)
0.00
0.00
 St. Gallen AB
669.2 m
 St. Gallen
669.6 m
0.27
 St. Gallen Rathaus
669.6 m
SBB to Rorschach and
SOB to Romanshorn
0.83
 St. Gallen Marktplatz
667.8 m
1.13
 St. Gallen Spisertor
667.8 m
1.75
 St. Gallen Schülerhaus
695.2 m
2.33
 St. Gallen Birnbäumen
(since 2009)
2.60
 St. Gallen Tivoli
(until 1982)
754.0 m
3.13
 St. Gallen Notkersegg
781.8 m
 Kurzegg
(only downhill)
4.52
 Schwarzer Bären
855.0 m
5.31
 Rank
862.8 m
St. Gallen
Appenzell Ausserrhoden
6.50
 Vögelinsegg
938.2 m
6.75
high point
956.1 m
7.25
 Schützengarten
935.0 m
7.64
 Speicher
depot and workshop
923.7 m
8.48
 Bendlehn
927.6 m
9.27
 Gfeld
917.4 m
9.80
 Trogen
S20 S21 S22
915.3 m
Notes:
  1. until 2018: km 2.56;   since 2018: km 2.42
  2. until 2018: km 2.33;   since 2018: km 2.19
Source: Schienennetz Schweiz and Swiss railway atlas
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