More recent case: https://medium.com/@hobnobbing/why-does-bart-use-5-6-rail-gauge-when-the-standard-gauge-is-4-8-5-f66a4097224d https://medium.com/@hobnobbing/w

More recent case: https://medium.com/@hobnobbing/why-does-bart-use-5-6-rail-gauge-when-the-standard-gauge-is-4-8-5-f66a4097224d https://medium.com/@hobnobbing/why-does-bart-use-5-6-rail-ga... "...BART planners switched to nonstandard gauge to ensure that only custom manufactured BART trains could use BART infrastructure."