The OO scale 1950s railway porter pointing to a station poster is one uniformed station staff figure with an outstretched pointing arm. Intended for supply unpainted in grey resin, he can be finished for your chosen railway. The poster in the painted example is part of the scene and is not supplied.
Stand him beside a timetable board, a travel poster, or a platform notice to direct passengers toward the information they need. His clear gesture creates a small exchange on the platform without requiring another figure to tell the story.
Give your station a porter who knows exactly where to send the passengers.