It took me 4-6 months to get an invitation to vocabulary and personality assessment for assistant conductor. Then BG and interview if you pass that. After that, they get you into Signals and Definitions. I didn’t make it that far, but that was how the process worked for me. If anything, you can try to start off as a cleaner or signalman and then wait 2-3 years before you can become an engineer, conductor, ticket usher, or any of that.