Yeah, that's not the commonly-accepted definition of "railroading;" that's just preparing to run a game. And honestly, what would be the alternative? just using a bunch of random tables for everything, and roll out in the open?
"You walk into a..." (rolls dice) "...cavern, and it's..." (rolls) "...dimly lit by a small campfire. In the..." (rolls again) "...center of the room, you see a..." (rolls) "...group of..." (rolls) "...five troglodytes, armed with..." (rolls) "...buckets and..." (rolls) "...large rocks with runes written on them? I guess? Anyway, roll intitative."
My players would tune out before I could even mention those buckets.