Won't call myself a newbie anymore, but still a rookie. To date I've only used Atlas snap-switches on my shelf layout et al. I'm working on a budget for my 7' x 10' garage layout, and these turnouts have me pondering. If I buy Atlas Mark 3 turnouts, for example (HO scale, #4 or #6), do I also have to buy either a ground throw or switch machine to go along with it??? In other words, just buying the actual turnout is useless without one of those devices???