Interior transparent surfaces
9.—(1) Subject to paragraph (2) any transparent surface in the interior of a regulated rail vehicle shall—
(a)be separated from an area in which a disabled person can walk, or go in a wheelchair, by a seat, table or other fitting; or
(b)bear a coloured marking which shall not be less than 140 millimetres and not more than 160 millimetres high and extend horizontally across the whole width of the panel at a height of 1,500 millimetres measured vertically from the floor to the bottom edge of that marking; or
(c)be bounded on any side which is not attached to the floor, wall or ceiling of the vehicle by a handrail which shall comply with regulation 10(2).
(2) Where such a surface is a door it shall comply with paragraph (1)(b).