We had a set of the beautiful D&H PA's. Great Alco sound set and powerful as all get out with twin Pittman motors. No flywheels but with judicious use of the throttle they were quite smooth. Lots of scale detail including windshield wipers, hoses on the pilots and multiple lights - front number boards, side number boards, center of the windshield, rear of each unit.
I'll post some photos when I get home later today. The sides were a handsome 'stainless' finish which stood out against the 'silver' painted trucks, pilots, and fuel tanks. Real beauties!