speed

speed can be of value in logistics 

if a normal passenger train travels 

from city A to city B 

then it's slow 

so only a few normal trains can travel every 24 hours 

on that track 

if a high speed passenger train travels 

from city A to city B 

then it's fast 

so many high speed trains can travel every 24 hours 

on that track 

if a maglev passenger train travels 

from city A to city B 

then it's very fast 

so very many maglev trains can travel every 24 hours 

on that track 

so if a maglev cargo train 

moves iron ore from an iron mine 

to an industrial area 

then it travels at 500 km/h 

so very many maglev cargo trains 

can transport iron ore every 24 hours 

to the industrial area