I booked a trip on an overnight train; for the night I wanted to travel there were no women-only compartments available anymore. So it is possible that there will also be a man/men in the same compartment with me. These are compartments of 4.
Suddenly I am worried that this might be against Catholic teaching and sinful. Are my worries founded, or am I being scrupulous? Is there something in the Catechism about this? Should I ask a priest?