There are a number of places where adjacent infrastructure limits station length to 480 feet, like Essex Street, Chambers Street, or Broadway Junction, for example. There are other places where stations would end up too close together. At Marcy Avenue due to the curve to the WBB the station an extension would have to be built to the east, and the station would get too close to Hewes Street. Of course in that case Hewes Street would likely have to close, and maybe a new Union Avenue station could be built to transfer to the .