"People meet there, pass by each other, and if they like one another they can start a relationship," Filip Drapal, spokesman for the Ropid company involved in the project, told AFP.
The special cars are part of a drive to make public transport more popular.
"We are planning a campaign to show people things they can do on public transport," Drapal said.
So along with reading or studying, bored commuters will soon be able to flirt or pick up a date
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Drapal said the company was now deciding which of a train's five cars would be most suitable, the number of trains to include and what kind of signage to display.
"We're planning a poll of passengers. The carriage will be marked, and there will be information on the platform and inside the carriage, in foreign languages too."
Passengers take some 1.5 million rides a day on the Prague subway's three lines. The capital is home to 1.25 million people.
"When I'm in a rush, I enter the first open door I see. I should watch out now and make sure no one starts seducing me," said Petr Voracek, quoted by the DNES daily.
"As a notorious metro catcher I'm afraid I might become the butt of gossip," added Karolina Vranova.