TOC's often take Customer Information Controllers from outside the industry, depending on their background. However, sometimes it works, sometimes not, as you do need a good appreciation of the workings of the railway to make your job easier. It is one of the less stressful jobs within the Control, generally the most stressful are the Train Service Managers. One error and you delay hundreds, if not more, passengers.
A CIC is also expected to listen to what is going on around them, as often the TSM won't be able to tell them straight away what they are doing, or why.
As a sideline, many years ago when I was a CIC, we used to do live broadcasts on Radio Kent. It wasn't unusual for the presenter to try and trip you up!
A CIC can often be a stepping stone for progress within Control.
Once staff go into Control's they only leave upon retirement........