The Warsaw–Kalisz Railway, also called Kalisz Railway is a railway in Poland connecting Warsaw and Kalisz. It was built between 1900 - 1902 by the Society of the Warsaw–Vienna railway in the Russian-controlled Congress Poland. The line was opened on 15 November 1902 connecting the railway junction in Warsaw with Kalisz near the border of the Russian Empire and German Empire. Unlike the earlier Warsaw–Vienna railway the line to Kalisz was built to the Russian broad gauge 1,524 mm (5 ft) to facilitate Russian military transports and limit the potential for interoperability with the European rail network.