Hello Paul,
Welcome to this forum.
May i give you some advice about the choice of your control system?
My advice is to choose a DCC digital system with decoders in your locs and points. It has an enormous amount of benefits, such as:
Unlimited number of trains / No extra wiring to the points / Control of all thinkable functions on your locs and wagons / Extremely realistic run of your locs / a constant power supply from the track to all your lightning in wagons, signals and buildings.
Of course this advice goes with another advice concerning keeping up your track conductivity:
Use diluted coppergrease in all your electric connections, it will prevent corrosion for many years (mine allready for 8 years) / use a cleaning pad, loco or car after every rain event / use a sanding pad with P800 grade sand-foam mounted at an angle of 30 degrees on a stick to walk around to clean the top of the track once a year after winter.
You can find a lot more tips in our book "Our Model Garden Railway"
To give you an impression, see the contents of the book below.
Succes!
Gerard