This is an idea that popped up one Sunday. A newspaper report on Chennai's Metro rail triggered it.
The Metro is now at the core of the city's transport.
It is being reported every day.
Thousands of people work on it.
'Who are these people?
So a social message went out - could we have visual profiles of say 25 or 30 workers at different spots on the Metro line - on Poonamallee High Road, on Mount Road or in Anna Nagar.
Get city photographers to click these pictures and ask Metro bosses to grant space on one of its rail station's campus to exhibit them.
This will be one way of saying thank you to unknown people who also make our city.
If you wish to join this group, seek the links on the Madras Day FB page.