The Parma trolleybus system (Italian: "Rete filoviaria di Parma" ) forms part of the public transport network of the city and "comune" of Parma, in the region of Emilia-Romagna, northern Italy. In operation since 1953, the system presently comprises four urban routes. Using only the above description and what you know about the world, "Since 1953 the Parma Troleybus system has been comprised of four urban routes." is definitely correct, incorrect, or inconclusive? 