GOOGLE (other internet search engines available) train / freight operating companies in the areas you are interested in. Go onto their careers / recruitment sites and check current vacancies. Also you can register for job alerts where the companies can inform you when they are advertising for specific roles you may be interested in. Job alerts can be a bit hit and miss with some companies though. A number of companies advertised for trainee train drivers the first half of 2020 so there are a lot of people in talent pools, on a recruitment process hold, going through delayed recruitment assessments, or being delayed in training due to COVID.