How active is that train track? Meaning how often does a train run on it? And when trains do pass on that track, how fast do they go?

Don’t get me wrong, sister, when I was in my teens in Russia in 1990s, I loved walking along railway tracks exactly like you do in that picture. But we really don’t want to have any of our lives claimed by unexpectedly passing trains - so you need to be very aware and very certain that you can get out of the way if a train approaches!