Platform gap filler
![Platform gap fillers in Hong Kong](/Images/godic/202501/14/MTR_Lo_Wu_Station_Platform_Gap_Filler5358.jpg")
![South Ferry station with gap fillers extended out to a 1 train, as reopened on April 4, 2013.](/Images/godic/202501/14/SouthFerryLoopReopening5358.jpg")
![The downtown bound side of 14th Street – Union Square, 2 April 2010. A retracted gap filler can be seen at the bottom of the image along the platform edge, with additional gap fillers visible in the distance.](/Images/godic/202501/14/14_Street-Union_Square_IRT_0035358.JPG")
Platform gap fillers on the metro systems like the New York City Subway or on train stations in Hong Kong are movable platform edge extensions at stations where the curvature of the platform creates a significant gap between the platform and subway car door.