Even creeping along at 20 mph 2 rail is quieter than the 3 rail layouts I've seen. In addition, the type and brand of equipment run seem to add to the noise. On Gargraves and Ross our MTH freight cars are louder, the Lionel Husky Stack is almost whisper quite. Cars with center rail pick-up rollers have those to add noise. Think the loudest things ever brought over were a high speed Pre-War Flying Yankee and an Aero Train.
Time permitting, will try some tests with all kinds of freight cars and a sound meter tonight. See how some box cars match up against each other.
