last train of the day
Colloquial term for the final train service of the day, often used in reference to the last chance to return home. The name comes from the red marker lights traditionally displayed on the last train.
If you miss the last train, you'll have no choice but to go home by taxi.
Literally 'red train car'. The term originates from the red marker lights that were traditionally displayed on the last train of the day, making it easily identifiable at night.