Märt Ehrenpreis, board member of Estonia's passenger train provider Elron, said it has been hard to meet demand at times.
"Roughly half the passengers are traveling between Tartu and Rīga, and there's also a lot of traffic to Vilnius," he said.
"In the near future, an additional Rīga-bound connection will launch on Fridays, Saturdays, and Sundays, so there will be two services toward Rīga. But on the return leg, there is still only the one current connection due to the rail...