These are all the Czech rail border crossings as of 2007.
Note that all of these railway lines were built in Austria-Hungary and became border crossings after the creation of Czechoslovakia in 1918.
Note that all these railway lines were built before the re-creation of Poland, so that some of them originally went to Germany, while others were entirely within the Austro-Hungarian empire.
Note that all of these railway lines were built before the dissolution of Czechoslovakia in 1993 and became border crossings in that year.
(in Czech) Detailed article about abandoned border crossings