There's basically two ways train wheels can operate, the flanges could be either "inner" or "outer".
Switches can be made in equivalent ways for inner and outer flanges.
We could expect that, just like some countries, as well as different railway companies within countries, picked up different rail gauges, they could have also varied between inner- and outer-flanges railways.
We could imagine that, just like today some countries have left-hand and right-hand traffic, there would be inner and outer style rail wheels. Except this is not the case, the "inner" style is almost universal. Almost, because the "outer" style indeed did exist in railways' debuts.
Is there a technical reason that makes the "inner" style preferable ?