From the lack of response, I'd say nobody's sure.
When I was to be interviewed by a company in California, the company paid for round-trip airfare (coach, or tourist, whichever it's called now), and two nights at a lower mid-range hotel, so I could be interviewed and take a look at where I was to work. The physical was done by my local doctor before I went, and he transmitted the info to the company. Note this was not a railroad, so your experience may differ greatly.