Police were called to apprehend the marsupial once the "rather incongruous sighting" was reported during rush hour near Zingem, a village in the Dutch-speaking Flanders region, the agency told AFP.
"The police tried to catch the animal but were unable to do so, so they called in a vet," Infrabel spokesman Frederic Sacre said. "The vet proved to be more skilled".
Rail traffic on the branch line was halted for about an hour in total, Sacre added.
"It's a somewhat incongruous appearance," said the Infrabel spokesperson, adding that they were more accustomed to disruptions caused by cattle or sheep on the tracks. "We had an alpaca a few years ago, we remember it."
It was not immediately clear where the animal had come from.
