I've been asked to make a rail to go up the center of a flight of stairs(or possibly 2 flights, i need to confirm this when i go to look at the job on thursday) The sides of the staircase are already taken care of and the purpose of the rail is to seperate people going down the stairs from people going up. Do i apply the same rules i would if this was for rails at the side of the staircase? and is there anything else i need to consider that i may have missed?