I have several older switches, or turnouts. They are made by Atlas, HO scale snap switch Right remote #51, and i also have left remote #50"s. I am just curius if they are equivalent to #4's or #6's. They still work, next thing im debating if i shoud just purchase new ones, or just use these. But i don't know which ones to use when im making my plans on the atlas track planner. Thanks for all the help.