Make sure there is a gap between the short ground rails of the switch and the track they are connecting to. They cannot make contact. Looking at the turnout, it would be the 2 short rails that create the letter "V". You may have to file them down to shorten them about 1/16". If you turn the switch track upside down, you will notice there are no copper connectors attached to these rails. They must remain isolated from ground. They are built this way in order to prevent a train from derailing if it should enter the turnout and the switch is not in the proper position. When the first set of wheels ride onto these rails, the axle will connect the ground to the outside ground rails and throw the switch to the correct position. Beware though, an engine made for 2 rail and 3 rail, will not operate this feature and the train will derail.