DKV opens second tram line in Debrecen, Hungary March 11, 2014 | Europe News The Transport Company of Debrecen (DKV) has opened Line 2 of the tramway in Debrecen, Hungary. The line extends 7.3-km from Debrecen Plaza on Line 1 and follows bus route 31 up to Doberd&oac... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password