"platform edge" is a correct and usable phrase in written English.
It can be used to refer to the area at the end of a train platform, typically marked with a yellow line. For example, "No one is allowed to wait beyond the platform edge as it is a safety hazard."
He squinted, toeing the platform edge as he sketched.
Please step away from the platform edge" came over the loudspeaker.
Somehow, this one item had slipped into the gap between train and platform edge.
To fix the problem, the authority plans to replace the brightly colored plastic strip along the platform edge, called a rubbing board, with a wider one.
Finally, if platform edge barriers are used, engineers must take care to prevent the possibility of passengers' getting stuck between the outer doors and the barriers.
The audible nudge, wafting above the tracks, is probably familiar to any New York City subway rider: "Please stand away from the platform edge".
The longest take is 16 words: "Please stand away from the platform edge, especially when trains are entering and leaving the station".
Shovelful by shovelful, they moved the snow from the platform edge to the middle of the platform, three feet per heave.
Considering that the actual escalator and elevator "sleeves" occupy considerable area, that platform edge clearance is needed and that additional unobstructed space is needed for maintenance equipment, it would be unreasonable to accommodate a second platform elevator.
The authority has also said it would consider testing platform edge barriers on a limited basis, though it cautioned that installing such structures on a wide scale would be "both expensive and extremely challenging".
