Scheduling rail timings

Hi everyone. I wish if someone helped me finding out a software which the railways use for 'Scheduling train timings". Tell me if any such software exists, if then where can i find it?

Thank You

The ‘software’ is a combination of hardcopy (aka Employee Timetable , published schedules, railroad-shipper contracts…) and wetware (found between the ears of the duty dispatcher.) I seriously doubt that any railroad in the United States (with the possible exception of BART) dispatches trains by computer.

Chuck