Why is exiting a train so mournful?
Is it that people are not energised and excited to start work? Do they fear the gap and are being extra careful? Are they contemplating a major accident on the rails? Are they fearful of what greets them when they get home?
Exiting a train could be a celebration.
It could be a relief to finally arrive at your treasured destination. It could be a moment of wonder that such a complex system of people, machine and thought got us across the city just on time. It could be a moment of thankfulness that this group of people had just taken a moment for connection.
Why are you travelling? Where are you travelling to? Are you on the journey to connect or arrive?
What happens if and when you finally arrive? Are you prepared to be mournful or are you going to have delight in your eyes?