I recently bought a Lionel Reading t-1. It worked fine until today. It wouldn't whistle so I switched the wires and I got it to whistle. I then added the bell button. Red to transformer and black to middle rail. Everything went downhill from there. I now have no sound and it only goes in forward. No reverse when I press the direction button. I switched the button under the tender, checked the pins and removed the bell switch. What did I do?? Please help. My daughters were excited about it until this happened. Thank you.