If you are running G scale be careful, you need a lot of power on outdoor layouts of any size, especially if you plan on running multiple engines with lighted passenger cars. not much reason to buy under 10 amp power supply (I use cheap $50 computer power supplies on my 175ft loop outdoors running twin Alco PAs with six lighted passenger cars). You still need a cheap throttle, but you can find them used for $30 bucks at many places. I use G Scale Graphics Railboss 4 RC remotes for each of my loops. Nice not being tethered to one spot. I sometimes lay on the grass at eye level and watch the train go by from 6" above the ground, it's fun until I try to get up.
Chris Sheldon