The first trolleybus in Budapest was inaugurated on December 16, 1933. Service was suspended after the Siege of Budapest in 1944, during World War II, but started again after the war on December 21, 1949. In honor of Joseph Stalin's 70th birthday that year, the trolleybus was given the designation of route 70, a designation that remains in place today. Other trolleybus lines in Budapest are also numbered between 71 and 79. As of 2015, the trolleybus fleet has nearly 180 vehicles serving about 15 lines.