Knowing Indian Railways, if you turn up at Delhi booking office they'd probably be able to sell you a through ticket to Machynlleth!
Which rail journey would, I think, nowadays actually be feasible, though not quick or easy...
A pet fantasy of mine involves the film
Fiddler On The Roof at the end of which, things are going belly-up in various ways, where the main characters dwell; and many are seeking to get out, to places where life may be more tolerable. If I recall correctly, one middle-aged maiden lady in the Jewish community there, decides that she wants to go and live for the rest of her life in Jerusalem. I spin a scenario in which she goes to the tiny station of the protagonists village of Anatevka, and asks for a fourth-class single ticket from there to Jerusalem. The Russian booking clerk is initially peed-off at such an outlandish requirement, and curses her up and down as an irritating Jewish bitch; but then, conscientiously does his stuff and works the thing out with correct routeing and fare, and sells her the ticket accordingly.
In theory, there would have been times in history when such a rail journey throughout, from somewhere in western Russia to Jerusalem, would have been possible maybe not both physically and politically, at the same time. At the actual period of
FOTR very early 20th century I suspect (unfortunately for the fantasy) physically, not some rail links in the Middle East would have been missing. Allowing of making ones own way across the strait between Europe and Asia at Istanbul; at times in the early-ish 20th century, I gather it could have been done. Certainly not politically speaking since 1948, because of difficulties involving Israel and her neighbours.