1.To avoid a uselessly wide gap between the step and the platform edge, the value 1,7 — E (see UIC Leaflet 560 § 1.1.4.2) can be exceeded in compliance with Appendix C, in the design of an outwards opening door with a step in open or closed position, or when the door and the step are moving between open and closed positions. In this case the checks hereafter should be carried out, among others to evidence that, in spite of the additional displacement, neither the door nor the step interfere with the fixed equipment (RAMO item 2.9 Annex 2). In the calculations the coach should be examined in its lowest position in relation to the running surface.