|} The
Swiss Northern Railway (
German:
Schweizerische Nordbahn, SNB), informally known as the
Spanisch-Brötli-Bahn, opened the first railway line within
Switzerland in 1847, connecting the cities of
Zürich and
Baden. This followed the extension of a French railway to Basel in 1844. The original line generally followed the south bank of the
Limmat from Zürich to near its confluence with the
Aar near
Brugg and then it generally followed the south bank of the Aar to Olten. It was absorbed into the
Swiss Northeastern Railway (German:
Schweizerische Nordostbahn, NOB) in 1853 and extended from Baden to Brugg in 1858. The line was absorbed into the
Swiss Federal Railways on its establishment in 1902. It is electrified at 15 kV 16.7 Hz and its eastern 16 km section from Zürich to
Killwangen-
Spreitenbach is now part of the
Zürich–Olten trunkline and has four tracks.