About train accident in Japan.

I guess you saw or heard in the news.
There was a train accident in Japan,
which killed 106 people.

Why did the tragedy happened?

One big factor is the tradition in Japan,
"strictness" about the time.
Trains MUST run ALWAYS "on time".
in fact, passengers can see "diagram",
a schedule of train arrivals and departures in every station,
and unless there are some emergency situations,
train arrives and leaves the station as it is written in the diagram.

There are also table of "how many minutes to arrive to which station",
"which station is good for changing to which lines",
"how many minutes to take in changing the lines",
etc.

about the subway in Tokyo, click here.

Q: Where is the borderline of "late"?
in Italy: after 15 mins.
in England: after 10 mins.
in Japan: after 1 min.

Usually, accuracy to the schedule must be within 30 seconds.
But in the case of Fukuchiyama line,
where the accident had occurred this time,
accuracy must be reported in "BY A SECOND".

The motorman who caused the accident was late for 90 seconds.
he had to arrive at next station on time.
or else, he will be suspended and his salary will be reduced.
thus he run at 100km/h in the railway,
where it's speed limit is 70km/h.

I wonder.
Must "Speed" be prioritized than "Safety"?