Николаевская железная дорога
The first railway in Russia connecting Saint Petersburg to Tsarskoye Selo, 27.9 km long, commissioned in 1837, is a part of the Oktyabrskaya Railway. So is the Moscow – Saint Petersburg Railway, the second oldest and one of the most busy lines in Russia, opened in 1851. It also includes the main line towards Tallinn (as far as the Estonian border), providing the track for GO Rail trains to Saint Petersburg.