Question

What was a result of creating rail standardization

Answer 1

Standardization of railways means standard, same measures, distance between rails, along the railway track. This again means that the standardized distance between the locomotive and wagon wheels corresponds to the distance of the rails, so that any train composition with standardized measures can use any track with also standardized rails.

The answer is: C.

Answer 2

Trains from different rail lines  could use  each  other's tracks.