WE ARE NEW TO MODEL RAILROADING AND ARE STARTING A G SCALE GARDEN RAILROAD WHICH WILL EVENTUALLY HAVE LOTS OF TRACK AND SEVERAL TRAINS. AT PRESENT WE WILL BUILD A LAYOUT WITH ABOUT 100 FEET OF TRACK TO RUN ONE TRAIN (WHICH MAY CONSIST OF 2 OR 3 LASHUPS). NO SWITCHES OR OTHER ELECTRICAL ACCESSORIES TO START. MY QUESTION IS – WHAT DO I NEED TO POWER THIS SETUP NOW AND IN THE FUTURE? I HAVE READ A BIT ABOUT THE ARISTOCRAFT ULTIMA 10 AMP. IS THIS TOO BIG OR TOO SMALL?