Switzerland's national railway has told its workers to stop using their normal orange reflective vests after confused Dutch soccer fans started following them on to the tracks.

A railway spokesman said the changed strip had been prompted by an incident in the Swiss capital Berne when a group of Netherlands supporters followed a worker on to the lines after mistaking his uniform for their traditional orange dress.

"We have now given out yellow vests to all our staff who have to work on or cross the tracks in Basel, where the Dutch fans are now based," Oliver Tamas said.

"It has raised a few eyebrows but we think it's a necessary measure to ensure the safety of our guests."