Thanks Jay will check out that forum.
If your having trouble with O gauge curves, I don't think weights are going to help on 0-27 but let us know if it helps.
Also the non motorized passenger cars have a plastic band around both sets of trucks, not sure if I am supposed to remove them. The manual was silent on it, so I left them on. The motorized unit did not have them, but running only the motorized unit, it would not negotiate the curves.
George