From what I see, "Railroad Medicare" is just Medicare under a slightly different name. See this Railroad Board webpage.
In the HSA interview in TurboTax, you are asked if you had Medicare at any point of the year. You should have answered YES and then on the following screen indicate which months you had Medicare.
This would have disallowed counting each Medicare month in terms of calculating your annual HSA contribution limit. That is, TurboTax would not have allowed you the HSA contribution based on that month. If you were on Medicare the entire year, then you would not have been allowed any HSA contributions at all.
Just to clarify, when TurboTax asks you your coverage for a month, you should indicate Self-only or Family only for those months when you have no conflicting coverage (Medicare is conflicting coverage). Don't answer Self-only or Family just because you also have an HDHP policy - if you have conflicting coverage, it's as if you don't have HDHP coverage.
Make sense?
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