Naming The Spot

Every rollerblader knows the names of some famous spots and when they travel or go to skate competitions they can recognize the spot.  Some of these names don't make any sense at all.  I understand the logic behind the Strawberry Ledges in England because strawberries grow out of the ledges.  I can understand the crayola rails because they are colorful rails.  I do not understand the black rails or the silver rails because aren't a lot of rails black or silver?  How's that going to help when they are giving directions? I guess this is yet another reason why I am a mere girlfriend of a rollerblader.