It might be needed for night trains (sleepers). Before COVID-19 in Finland you could reserve a single bed for women or men, which meant your share the compartment with a stranger of the same sex.
A model which of course assumed sex is strictly binary and having strangers of opposite sex in the same compartment is problematic, while having strangers of the same sex is unproblematic.
A model which of course assumed sex is strictly binary and having strangers of opposite sex in the same compartment is problematic, while having strangers of the same sex is unproblematic.