The young couple stopped the girl in front of me. She half-listened to them through her AirPods and brushed them off.

I nodded my willingness. They gripped each other’s hands and pleaded for the way to Černý Most. I led them through the tunnel and down the stairs. “This is your train, I’m going the opposite way,” I said.

The next station name came over the speaker. I got out. The display showed six more minutes until the return ride.