Algorithmic Methods for Railway Optimization : International Dagstuhl Workshop, Railway Optimization 2004, Dagstuhl Castle, Germany, June 20-25, 2004, Bergen, Norway, September 16-17, 2004, Revised Selected Papers - Frank Geraets, Leo Kroon, Anita Schoebel, Dorothea Wagner, Christos D. Zaroliagis ((Lecture Notes in Computer Science))