During construction, the weight had increased from 149 to 170 tonnes; to reduce this to 158 tonnes, the original idea of step-free access was discontinued.
The platform entrance now leads across a high ramp, which gives step-free access via escalators and elevators from the reception hall to the platforms.
This arrangement, through not requiring a mechanical transmission, allowed for a low floor and a step-free entrance into the lower deck from the rear platform.