Hey all, I've been browsing this site for quite sometime and became a member last year. Great info being passed and hopefully I can do the same.
I'm on the list for track worker 3600 and yesterday took the TO 7604. While neither would benefit from some sort of study guide, the TO exam is slightly more difficult. There really isn't any preparation you can do for it because all information needed to pass the exam lies in the booklet provided. Like most have said here, the exam is testing your cognitive abilities. I.E if you can correctly deduce how to proceed after reading a service change notice, follow procedures, etc.
If anyone has specific questions, please feel free to ask. Good luck to all.