Started working on the model with fewer variables
Model with fewer variables complete
Added missing constraint
Improved output
Added instance with 2 trains
Removed blank lines
Bound checking in cleanup_adjacency()
Bound checking on headway constraints
Tightened 'for' bound on headway constraints
Corrected typo t -> tt !!!
Check bound on 'for' in sidings constraint
Added instance with 3 trains
Merge branch 'fewer-variables'