Community users DawnC0 and KarenJ2 posted the solution to your W-2, Box 14, RRT1 issue at this link. I've copied the solution here for your convenience:
ADD another line 14 entry with the same amount as in Box 1 Wages. Select code - "Railroad Compensation." Code RR
You received the error message because the amount on Line 14 is greater than allowed, but entering the above information will allow your railroad income to be properly reported.
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