Brunel & the GWR called 1435mm "narrow" gauge, but most of the rest of the world since then would call it standard (with a range of notable exceptions). There w

Brunel & the GWR called 1435mm "narrow" gauge, but most of the rest of the world since then would call it standard (with a range of notable exceptions). There were (and are) many narrow gauge railways in Great Britain as well, commonly 2ft gauge or around that size. Bogie exchange is a fascinating process, something I wouldn't have expected to work. I recently learned about variable gauge bogies, pretty interesting as well: https://en.m.wikipedia.org/wiki/Variable_gauge#Countries https://en.m.wikipedia.org/wiki/Variable_gauge#Countries