How to become a railroad mechanic?

I have a friend who has an A&P license (which allows him to perform maintenance on aircraft) and would like to know how to become a railroad mechanic. He believes that rail will become an important means of transportation in the near future and so he would like to get into that field. Anyone here knows where he... show more I have a friend who has an A&P license (which allows him to perform maintenance on aircraft) and would like to know how to become a railroad mechanic. He believes that rail will become an important means of transportation in the near future and so he would like to get into that field. Anyone here knows where he could get schooling or an apprenticeship to become a RR mechanic? Much obliged in advance.
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