Thank you! I have not done either because this one is "brand new" so I will be bummed if it has the same issues as my old one. Will report back

Hi! I am new here but have a frustrating question for you guys. I had a EMD GP40 Diesel from years back and it used to work great, but when I pulled it out to put around the christmas tree I could not get it to run. I did the typical fixes, check the tracks, make sure wheels are alinged, clean tracks etc, but nothing worked. I took it apart and it looked like on of the gears had broken in the wheels. Ok no problem I find the same one online and I put it on my tracks. Now it runs, barely, as I need to crank it up close to the highest power to get it to move and there is this clicking sound. I have no idea what is up and any thoughts would be helpful. Thanks!