When a Routing Table has wrong regex and a cart comes by the Routing Switch Motor containing the faulty table, it crashes the game. This problem causes world "corutption" until switch motor is removed (I used MCEdit). The logic behind the regex code needs to catch the error and display an in-game error similar to syntax error. (error crash dump in http://pastebin.com/JRV9ZHtK) Problem at https://github.com/CovertJaguar/Railcraft/blob/master/src/main/java/mods/railcraft/common/blocks/signals/RoutingLogic.java

Duplicate with #518 and had been fixed in 2b29dde. Please wait for next hotfix.