{"gt_parse": {"text_sequence": "ified with over head wires , then changed to third rail and the n back again in 1992 to ov erhead wires in the course of its adaptation for the Manchester Metroli nk. Trams in city centre st reets, carrying collector shoes p rojecting from their bogies, were considered too dangero us for pedestrians and motor traffic to attempt dual-mode technology . The same thin g happened to the West Cr oydon – Wimbledon Line in Greater London wh en Tramlink was opened in 20 00.Thre e lines ou t of five mak ing up t he co re of Bar celo na Metro network changed t o overhead power s upply from third rail. Thi s operation was also do ne by stages a nd completed in 2003. The opposite t ransition took place in Sou th London. Th e South London Line of th e LBSCR netwo rk between Victoria an d London Bridge was e lectrified with c atenary in 1909. The system was later exte nded to Crystal Palace Coulsdo n North and Su tton. In the course of mainline third rail electr ific ati"}}