What is the 7pm rule?

What is the 7pm rule? The old 7pm rule obliges a customer to fill in the date of arrival if he boards a direct overnight train after 19:00h (7pm), provided the train arrives at its final destination after 04:00h (4am).

The old 7pm rule obliges a customer to fill in the date of arrival if he boards a direct overnight train after 19:00h (7pm), provided the train arrives at its final destination after 04:00h (4am).