Here the wall is back-filled with topsoil and I have begun to lay track. I like section track made by USA Trains, because it doesn't get cruddy as quickly as the other leading brands. I've laid it on a brick foundation, because I wanted it on something firm but not as permanent as concrete. The bricks make it easier to realign later as will be evident in later pictures. Emma is worried about the 4' diameter hairpin loop and she's right. Later I managed to increase the diameter to 5' by moving to the property line beneath the hedge. The rubber mallet is ideal for urging the bricks into position.