The Libertarian Loophole is exemplified by their position on public transportation, they don't oppose public transportation they just don't want the government doing it - let the free market provide it if the public want it! Except, of course, the free market demands a quick high return. Railways by their very nature are a long term low yield investment generating a return on a scale of 30-40 years, not by the next financial quarter. Something the public can and will accept for public infrastructure. But not business interests. So what the libertarian argues for is a situation where economic strictures ensure it will not happen but they can insist they do not oppose it.
the "libertarian loophole" is what they call they call the straps on their daughters training bra
Libertarians also want to move away from an expansionary monetary policy which is literally the glue that holds our entire modern capitalist society together.
These folks are just nuts. They essentially decided that all government is bad and then came up with policy ideas to match that rather than having a politics that seeks to achieve a particular social goal. Even neoliberal capitalism is broadly about maximizing global production. Social democracy maximizes liberty more than rejection of government ffs.
Libertarians are either phonies, posturing, or completely ignorant. Even the hyperliberal/hypercapitalist pre-WWI Bourgeoisie knew they needed the state because it was the only entity capable of protecting their investments and their property, as well as of building the infrastructure and selling concessions on them (e.g. railroad, to take your example).
By their very philosophy, Libertarians believe that markets are the most efficient way to provide goods and services. This allows the perverse incentives of Capitalism to exist, so it is in everybody's best interest to chase individual short term gains (which brings collective long term pain). They do not stop to think about the consequences of their actions & don't value long term planning & preparation. Foresight is antithetical to Right-libertarian ideology.