Find here some explanations about some points of rules discussed by some users.
"FALSE" STRAIGHT LINES
The straight lines with tunnels pointing in different directions are allowed.
Without a station, cute angles are not allowed to continue a line.
From a station, cute angles are allowed to continue a line. But it's always forbidden that a line goes along itself !
When a line goes another line : A station must be built as soon as the continuation of one line do no follow the other line, i.e. : - following a different direction - and/or continuing after the point where the other line ends for now
Important : consider only the line, not the tunnels. So, if a line goes along another one with tunnels pointing in different directions ("false straight line"), there's NO STATION TO BE BUILT !!! (see exemple 7 of the rule, last picture).
BEGINNING A LINE :
It's a normal turn. So you build 3 tunnels, not only 1 in the starting place.
TIP : You MUST TRY to place all your destination counters, with a station near each. If not, you loose each time 6 points : so you suffer a terrible loss with EVERY OTHER PLAYER - exactly the same as if THEY ALL succeed a fastest trip !