My pacific is about 3 years old. It's been a great workhorse, pulling up to 10 passenger cars at displays that our club as put on in the past. However this year it seems to be losing it's touch. Definitly slowing down now in the curves (20'dia) while pulling 6 heavyweights, and can't seem to handle a 2% grade at all. I've since lubed the wheels of the passenger cars which has helped, but it's still losing power noticably. Any suggestions before I dive in and drop some oil on the gears would be great. It probably does need normal maintenance, but maybe it's something else?