I have over 200 Freight Cars & 36 Passenger cars & the newest one is from the 80's & all except a few of all 65 of my engines are all reworked clunkers. If I need to I change motors, gears & have replaced a lot of Wheels on Athearn Engines. All my rolling stock has metal wheels & Kadee couplers & all my engines have LED lighting, metal wheels, Kadee couplers & new hand rails when needed. I take to the older engines w/the pancake motors & make Dummies(16) out of all of them w/Metal wheels & Kadee Couplers.