When I was on platform of Musashino line

Freight trains run on Musashino line.
Since they don't run on the lines in my home province, a freight train seems to be odd for me.

By the way, when I saw a freight train on Musashino line, I thought about its role.

Frequently, people say "Traffic channel are main artery of economy".
Because traffic channel transports supplies and humans.
It's true about the former.
However is it true about the latter?

Certainly, the face-to-face communication is important.
But not face-to-face communication styles(TV Telephone or something) are becoming common.
So I think that the latter will not be true on human communication part.
And, on other parts including labor power, the latter will also be not true by some technology like remote control robots.