 Because tram/light-rail/streetcar vehicles often share railway gauge sizes with heavy rail vehicles, these passenger vehicles usually also use high floor designs.Existing tram/streetcar/light-rail networks generally feature low platforms as many of the stations or stops are in the streets.The high construction/conversion cost of high platforms and the difficulty of making high platforms compatible with other features of the urban landscape are a significant obstacle to converting tram networks these into urban or commuter rail networks with high platforms.