The Boulevard Line (Danish: "Boulevardbanen" ) is a 3.2 km long partly underground railway between Copenhagen Central Station and Østerport Station in Copenhagen, Denmark.
 The quadruple track railway carries today one dual track for the Copenhagen S-train system and another dual track for the mainline railway and regional trains.
 The line has two intermediate stations, Vesterport Station and Nørreport Station.
 It continues above ground to Nordhavn station and at Svanemøllen station the tracks separate towards either Ryparken station or Hellerup station.
 Dybbølsbro station is also located along this railway, located just a bit south of Copenhagen Central.
 Out of the four main S-train branches, three follow this path, between Dybbølsbro and Svanemøllen (with at least four tracks).
 Only at Copenhagen Central, Nørreport and Østerport do all trains stop.
 While Dybbølsbro, Vesterport, Nordhavn and Svanemøllen all are S-train stations only.
 (Nørreport also has Metro service, just as both the Central Station, Østerport and Nordhavn will have by 2019).
The Sir Leo Hielscher Bridges are a side-by-side pair of road bridges on the Gateway Motorway (M1), which skirts the eastern suburbs of Brisbane, Queensland, Australia.
 The western bridge carries traffic to the north and the eastern bridge carries traffic to the south.
 They are the most eastern crossing of the Brisbane River, the closest to Moreton Bay, crossing at the Quarries Reach, between Eagle Farm and Murarrie.
 The original bridge (formerly named the Gateway Bridge) was opened on 11 January 1986 and cost A$92 million to build.
 The duplicate bridge was opened in May 2010, and cost $350 million.
Cheltenham , also known as Cheltenham Spa, is a regency spa town and borough which is located on the edge of the Cotswolds, an Area of Outstanding Natural Beauty in Gloucestershire, England.
 With a motto of "Salubritas et Eruditio" meaning 'health and education', Cheltenham has been a health and holiday spa town resort since the discovery of mineral springs in 1716 and has a high number of internationally renowned and historic schools.
Pedras Salgadas (] ) is a small spa town in the district of Vila Real, in north central Portugal, located approximately 37 km north of the district capital of Vila Real.
 It is famous for its mineral waters.
 There are several small hotels in the area, which cater to tourists who want to relax in the green countryside and benefit from the spa facilities located there.
 In 2010 the Portuguese beer and water company Unicer opened a brand new spa complex in the town.
 Pedras Salgadas is located in the municipality of Vila Pouca de Aguiar.
 Both are located on N2, the national road linking Chaves with Vila real.
 The new four-lane A24 highway passes a few kilometers west of the town and is connected by a feeder road.
 The railway was closed in the nineteen eighties and the abandoned railway bed has now been tarmacked for use as a cycling and walking path.
 This path extends to Vila Pouca de Aguiar, at a distance of about 10 kilometers.
The Tauern Railway Tunnel (German: "Tauerntunnel" ) in Austria is the longest tunnel of the Tauern Railway crossing the main chain of the Alps.
 Currently, it has a length of 8.371 km .
 The highest point of the tunnel, which is also the highest point in all of the railway line, is at 1226 m above sea level.
 The tunnel's north entrance is at Böckstein in the valley of Bad Gastein in the state of Salzburg, the south entrance near Mallnitz in Carinthia.
The Sumner Tunnel is a road tunnel in Boston, Massachusetts, United States.
 It carries traffic under Boston Harbor in one direction, from Logan International Airport and Route 1A in East Boston.
 The tunnel originally deposited traffic at the west side of the North End but with the completion of the Big Dig, it was modified to have two exits.
 One travels under I-93 and emerges on the west side of I-93 near Haymarket Subway Station.
 The other exit routes traffic to I-93 North and Storrow Drive.
 Traffic headed for I-93 South and the Massachusetts Turnpike (I-90) West is normally routed to the Ted Williams Tunnel.
Poděbrady (] ; German: "Podiebrad" ) is a historical spa town in the Central Bohemian Region, Czech Republic.
 It lies on the river Labe 50 km east of Prague on the D11 highway.
 It obtained the status of town from the Czech king in the year 1472.
 A historic milestone in the life of the town was the year 1905, when it was visited by the German estate owner Prince von Bülow.
 This well-known water diviner found in the inner courtyard of the castle signs of a strong spring, which was later bored to a depth of 97.6 m .
 The discovery of carbonic mineral water resulted in the opening of the first spa in 1908.
 After World War I Poděbrady rapidly changed into a spa town which from 1926 specialized in the treatment of cardiovascular diseases, rapidly gaining renown not only in the Czech Republic, but also abroad in countries including Austria, Germany, Russia and the United States.
Bad Gastein (formerly "Badgastein") is a spa town in the district of St. Johann im Pongau, in the Austrian state of Salzburg.
 Picturesquely situated in a high valley of the Hohe Tauern mountain range, it is known for the Gastein Waterfall and a variety of "Belle Époque" hotel buildings.
The Tauern Railway (German: "Tauernbahn" ) is an Austrian railway line between Schwarzach-Sankt Veit in the state of Salzburg and Spittal an der Drau in Carinthia.
 It is part of one of the most important north-south trunk routes ("Magistrale") in Europe and also carries tourist traffic for the Gastein Valley.
 The standard gauge railway line is 79 km long and climbs the High Tauern range of the Central Eastern Alps with a maximum incline of 2.5%, crossing the Alpine crest through the 8371 m long Tauern Tunnel.
 It is one of the highest standard gauge railways in Europe and the third highest in Austria.
A double junction is a railway junction where a double track railway splits into two double track lines.
 Usually, one line is the main line and carries traffic through the junction at normal speed, while the other track is a branch line that carries traffic through the junction at reduced speed.

Question: Tauern Railway carries traffic for which spa town in Salzburg?
Answer: Bad Gastein