Boarding system for a vehicle with a multi-part boarding ramp

A boarding system for a vehicle comprising:

• a cassette for accommodating and displaceably mounting a sliding step, wherein the cassette is configured to be arranged below a door opening of the vehicle,
• a sliding step which is configured to assume an extended or a retracted state by a displacement motion,
• a cover flap for closing the cassette at least at the front and for covering the sliding step in the retracted state,
• a tread strip which at least partially closes the cassette at the top and covers the sliding step in some areas,
• wherein,
• the boarding system comprises a coupling element which mechanically couples the tread strip, the cover flap and the sliding step to one another, and
• the coupling element is arranged such that, in an at least partially extended state of the sliding step, the tread strip, the cover flap and at least a part of the sliding step form a boarding ramp for facilitating the boarding of persons into the vehicle.