this line is a union of pre-1982 trolleybus line 43 (barca), west of the city centre, with a new route east of the city centre to form a double-ended radial route (or cross-city route), between the barca district and the san vitale district. it existed in this form as a bus route for many years before the start of its phased conversion to trolleybuses in 2012. the eastern half was built from scratch, having never previously been a trolleybus route. along the western half, to piazza giovanni xxiii in the barca district, the old trolleybus wiring was completely renewed, but the support poles were re-used. most works were completed in 2006, but the line's opening was delayed. in the meantime, the planned line 14 had been extended, by the addition of two branches on the eastern section: 14a (the main line) to the end of via due madonne (depot) and 14c to the end of al pilastro (as well as a third branch, 14b, for the roveri industrial area, to operate only in the morning rush hour).