nfitz
Superstar
That's an interesting definition. Crush loading on a Line 4 trains is 972 people. That's as much as crush loading on many lines that are considered heavy rail, and gives a total capacity of near 39,000 an hour - well probably not, as you can't run trains every 90 seconds at crush loading. But still!In a way, Line 4 functions as a light metro today. Although it could be easily reconfigured to do a heavy metro's job, if the demand for that existed.
By this definition, some of the tube lines in London are also "light rail or light metro" (perhaps even most of the deep tube lines).