Trolleybuses in Plovdiv Trolleybuses in Plovdiv The Plovdiv trolleybus system () was a part of the public transport network of the city and municipality of Plovdiv, the second most populous city in Bulgaria. Opened in December 1955, the system had waxed and waned in size over time. As of the beginning of 2012, it was made up of only one route. There are current disputes between the operator and the municipality regarding the validity of the trolleybus contract. Gradski Transport Plovdiv is still the operator of this type of transport, despite the numerous infractions of the contract since 2010. In October 2012, because
Plovdiv Airport and Frankfurt) in 2015 after two years of stable operation. The government have started the first concession procedure back in 2011, but there were no candidates for it. The second attempt for the concession was made in the spring of 2016 when the government have opened a tender for a 35 years concession of the airport, but the tender was shortly cancelled for non-compliance with European rules. In December 2016 the government opened the 3-rd tender for the concession. In the new procedure 3 companies have made the bid for the airport - Silk Road Plovdiv Airport, Consortium Plovdiv Airport