London Underground at +420 V, giving a potential difference of 630 V. On the sections of line shared with mainline trains, such as the District line from East Putney to Wimbledon and Gunnersbury to Richmond, and the Bakerloo line north of Queen's Park, the centre rail is bonded to the running rails. The average speed on the Underground is 20.5 mph. Outside the tunnels of central London, many lines' trains tend to travel at over 40 mph in the suburban and countryside areas. The Metropolitan line can reach speeds of 62 mph. The London Underground was used by 1.379 billion passengers in
Guadalajara light rail system the large numbers of users of the rail system, there are plans to extend Line 2 to the west and to build a third line. Line 1 runs underground in the city center, but runs "at grade" north and south of the city center, and its surface sections include several level crossings, protected by crossing gates. The station platforms accommodate trains composed of no more than two cars. Line 2 is entirely underground except for a non-passenger section at its east end, connecting the last station to the maintenance facility. Its stations are long enough to accommodate trains of up