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[quote user="Murphy Siding"]      Is it possible, that double track has crossovers, to allow for bi-directional running?  Double track would be two, parallel tracks, where a train can't be switched from one track to the other?[/quote]Double track can indeed have crossovers but they are hand-throw and if a train uses the crossover it is now running against the current of traffic on the wrong track, and thus has no signal protection.If you see crossovers in double-track that are signaled, they are not crossovers in double-track at all, but is CTC or an interlocking and it is multiple main track.People do get confused by this stuff.  It usually stems from people using definitions that are imprecise while the railroad industry uses definitions that are highly specific and limited, e.g., they see two parallel main tracks and think "aha, that must be double track."  Well, it could be Double Track and it could be Two Main Tracks.  To know which it is you need to either look at the employee timetable and see what it tells you; or, if you know something about signaling and Methods of Operation, you can study it and figure out which it is.  Rules of thumb:1.  Look at the intermediate signals (the ones with number plates).  If the track is signaled in both directions with numberplated signals, it's two main tracks.2.  If the intermediate signals are one direction only on each track, it's double-track.3.  If there is two tracks that both appear to be mains, and neither is signaled, it could be dark double track.  This is quite rare, however.Double-track often begins and ends in control points that are, within their limits, short sections of multiple main tracks.  Control points have to be signaled at all entrances, thus there will be a signal facing the "wrong way" on one of the double tracks.  You can tell a controlled signal because it has no number plate.S. Hadid
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