Evening
From my own experience, I cannot see the harm in submitting multiple applications with the same TOC. It's a very competitive market and you have to at least chance your arm at any job you are suitable for. I've had numerous rejections, but I have reached the interview stage three times in the last few months - sadly I lost out to other candidates. It's a case of keep plugging away!
The issue arises when a conditional contract of employment is offered. From my understanding people who pass everything and end up in a talent pool for driving and conductor roles are not under any contract. From reading other threads on here, many people can end up in a talent pool but never get their dream job. Therefore, I cannot see why you should not be able to apply for new roles cropping up with the same TOC.
Ultimately, I would be tempted to get the answer straight from the horses mouth and contact the respective HR to verify their rules on this.
CJ