The v1.1 patch is required for cheats to be enabled.
Press [Shift] + [\] during game play, then enter one of the following codes and press [Enter]
Note: Jobs completed with a cheat enabled will be flagged with a check mark and cannot earn a blue ribbon.

brian - Unlock jobs in job
neal - Turn off speed limits until the end of job
paul - Unload selected
chris - 300 second time
andrew - 30 second time
lionel - Mark current job completed
moveit - Give all trains speed