Del Wiki de Rocrail
http://wiki.rocrail.net/doku.php?id=route-gen-enCrossing Blocks
If the From-To block crosses other blocks it should be set here to avoid collisions.
It is a comma separated list of block ID's without white space (blanks).
Note: All the block definitions are ignored, if this block is used as a Crossing Block in a route. Apart from that, this block can still be used in other routes as a regular or as a crossing block.
Tips
Crossing blocks can be kind of misused to set up a route over one or more normal blocks to get a very fast connection between two points of the layout.
Crossing block signals can be controlled by adding them to the Route Commands.
Crossing blocks can be used to create routes over a block for none fitting trains. (Length, permission…)
Example:
If a train needs to travel from Block “BK 1” to Block “BK 4”, without stopping in Block “BK 2” or Block “BK 3”, then you can create a Route “BK 1-” to “BK 4+”, with an entry in “Crossing Blocks” of “BK 2,BK 3”.