Metro Line M4 (Budapest Metro) Metro Line M4 (Budapest Metro) Line 4 (officially: South Buda–Rákospalota (DBR) Line, Metro 4 or M4, and unofficially: Green Line), is the fourth line of the Budapest Metro. It opened on 28 March 2014. The first section, 7.4 km in length and consisting of ten stations, connects the southwestern Kelenföld vasútállomás located in Buda, and the eastern Keleti pályaudvar in Pest, under the River Danube. While three additional sections — one an eastern extension to Bosnyák tér, the second west to Virágpiac, and a third further east to Újpalota — have been planned, these remain unfunded by the Budapest city
Budapest–Belgrade railway International, financed with Russian credit. The reconstruction of the section Novi Sad-Subotica is set to begin in 2019, with estimated cost of €943 million, built by a Chinese company and a duration of 33 months, during which this section will be closed. The railway line between Budapest and Belgrade was used also by the Orient Express until 1914. The Orient Express was launched on 5 June 1883. It connected Paris and Constantinople. Budapest–Belgrade railway The Budapest–Belgrade railway connects the capital cities of Hungary and Serbia – the Budapest Keleti railway station with the new Belgrade Centre railway station. As a