I installed the LGB 10345 shuttle unit and it short cycles. The loco starts up, then reverses before it reaches the break at the first diode. After it passes the diode, it does not reverse, but continues in the same direction to run off the track. Checked to see that the track break sections are on the same rail. Checked to see that the diodes are pointed in the same direction. Double checked the wiring diagram to be sure that the power supply and the track power connections are correct. Please help. Bill Martin, Nashville, Tennessee