- Boarding guides are being used in S-Bahn (metro) systems to ensure that stopping times are on schedule. They support and speed up boarding and alighting by directly addressing passengers or through platform announcements. This was successfully trialed in the previous year at the central stations in Munich and Frankfurt am Main. The boarding guides are being gradually put into regular operation at selected stations. This concept was also piloted for the first time with regional transport at the Frankfurt am Main central station. We are currently looking at expanding this service.