Two weeks ago, China became the first nation to operate a maglev railway commercially, when officials inaugurated a 30-kilometer-long line between downtown Shanghai and the city's airport.
There is a 30-kilomter-long line that runs in China.
( z1 line :ARG1-of ( z2 long :ARG2 ( z3 distance-quantity :quant 30 :unit ( z4 kilometer ) ) ) :ARG1-of ( z5 run :location ( z6 country :name ( z7 name :op "China" ) ) ) )