By whom?
The way I am using the word "railroad" is a way that I have been using to meaningfully communicate about RPGing for multiple decades.
The Louvre is an actual place. People can move through it using their own limbs, their own motive power. In doing so, if they are sighted than they can see many things in virtue of physical and neural processes that take place, involving the surfaces of the displayed objects, the retina, as well as the properties of light.
The equivalent to doing that, when playing a RPG, is the fact that I can see, talk to, interact with, shake my fist at, etc my fellow participants in the game.
The experience I am describing as a railroad is not the experience of moving around, seeing many things, talking to many people. It is the experience of having one person - the GM - establish the shared fiction, in virtue of (i) specifying all the elements, and thereby (ii) specifying all the consequences of actions I declare for my PC, either directly or by extrapolation from what they have specified.
That has nothing in common with visiting the Louvre, where I get to see the products of many imaginations all on display to enjoy, compare, etc. In fact it's virtually the opposite of such a visit - I get the content of exactly one imagination, told to me by the GM.