The "nationwide flirt" took place in 10 German cities on Valentine's Eve, the train operator said, with demand outstripping available seats six-fold.
In the capital, the singles, ranging from late teens to late middle age, are guided straight to the platform bar where, to get the lonely-hearts in the mood, party music blares and sparkling wine fizzes from bottles.
In one event, there was hardly any space between the tables.
They were followed-up by the researchers six weeks and 12 months after the speed-dating session.
In a different present-day world, single people have started to die.
The lonelier they are, or the more broken their heart, the faster they die. In this environment, people have taken to desperately and ruthlessly finding their perfect match, though it may mean death for everyone they reject or leave.
Usually, the participants have one-to-one conversation in a very limited time (usually less than 5 minutes).
Once the time limit expires, a bell ring signals that it is time to move to a next chair or table in order to interact with another colleague.
Consistent with parental investment theory, women, on average, tended to state an interest in long-term mating more so than men did.