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Tip!
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Where is the mistake?
The capacity of a rail is insufficient.
Either a fast train tries to get ahead of a slower one or
two trains use the same track in opposite direction.
How you can revise the mistake?
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Have a look at the diagram. Can you find two trains which leave the same station
with the same target station at the same time range? A train gets ahead of another train
if and only if the timetable lines of the trains intersect. Be sure that there is
a double-track between the start station and the target station.
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Have a look to the diagram. Can you find two trains which use the same track
in opposite direction at the same time range. This means the target station of
the first train is the start station of the second train and vice versa.
Does the connection consist of a double-track?
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If more than two tracks are required, try to change the timetable in order to
relieve the track.
You can not find the mistake?
The description of the flaw you can find here.