I work on a heritage railway and I have done for a while I’ve never thought about going for the mainline I would be considered too dangerous and an operational liability by them from what I’ve heard mainline do like rookies because they are faster easier and cheaper to train than somebody like me would be
Perception is not reality.
As posted above by @Lumpa6259 ; it is how you apply those skills gained in your sector that will determine how successful you are. You have plenty of experience to apply and have a proven track record of working in a safety critical environment.
There is no free pass. You need to work at it and put a lot of effort in to what is a very competitive market. I think a lot of people falsely believe that because they have a specific background they are guaranteed a job. It also works vice versa. People belive that because they are in a specific industry or have a specific background that they would get rejected or that they don't have the required skills.
The barriers to entry shouldn't start with yourself. Meet the criteria, apply, push yourself, make a decent effort, and if you fail; reapply.
