The premise of Georgism is that there is no creation of locations (at least unless you're in the business of creating planets).
> Places that were too far from London to be useful suddenly became Locations
No, those were always locations, before and after the construction of railways made them more valuable. Accordingly, Georgists ain't interested in taxing the gains of the railways themselves; we're only interested in taxing the gains of the landowners profiting off of their land suddenly being more valuable from no contribution of their own. Under LVT the railway companies still would've made their money back in droves — probably moreso if they're only paying taxes on the land under the railroads instead of the actual railroads themselves!