Budapest later, with the help of the Russian Empire. 1867 was the year of Reconciliation that brought about the birth of Austria-Hungary. This made Budapest the twin capital of a dual monarchy. It was this compromise which opened the second great phase of development in the history of Budapest, lasting until World War I. In 1849 the Chain Bridge linking Buda with Pest was opened as the first permanent bridge across the Danube and in 1873 Buda and Pest were officially merged with the third part, Óbuda (Old Buda), thus creating the new metropolis of Budapest. The dynamic Pest grew into
Budapest–Újszász–Szolnok railway Budapest–Újszász–Szolnok railway Budapest–Újszász–Szolnok railway line is the number 120a line of the MÁV. It is a double track, electrified track, which is part of the international rail system. It goes on as Line number 120, which connects Budapest, Békéscsaba, Lökösháza, Arad (in Romania)]. The line from Budapest to Szolnok is 100 km long. Starting from Budapest as far as Rákos, it runs on the same track as the 80a line. Here it turns to South-Southwest, crosses the plain of Pest and the South part of the hills of Gödöllő. Its route follows the Tápió and Zagyva rivers, crossing at Újszász.