Hi there.
I am new to this hobby of trains, and am enjoying it. I first bought myself and son the Chattanooga. I Love the traditional old trains.
After purchasing the train set, I have also purchased some additional coaches. What I have noticed is that with the set all the wheels are plastic, and those coaches that I bought afterward have metal wheels, I also see that the coaches with the metal wheels pull easier and run further if gently pushed by your hand. I see you can buy metal wheels on their own, can I use these to replace the original plastic wheels of the train set I bought? and also which size 36" or 33". Thank you. Russell