Yes, box 14 is used for many things. They are used for state and local returns most often, but will also be used for federal purposes if they are deductible expenses, which most common a state or local tax such as an employee unemployment tax (some states have this). Fringe benefits can also be entered into box 14 and you can see all of the items in the instructions. Most often it's not really used on the tax return.
For the WAGES you should select 'Railroad Retirement Compensation', then add another box 14 item and review the other Railroad categories for the RRMD, if you're not sure you can select 'Other (not classified)'.
Or if you could clarify what the RRMD is, post a note here and we can direct you further.
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