A train applies steel wheels to a steel track. Therefore, without any distortion of the wheel or track, the contact patch would be extremely small. Now, if you slice a chord from the wheel, creating a flat spot contacting the track, the result is a larger contact patch. With a larger contact patch, more friction will occur between the wheel and track, but the weight will be spread over a larger surface area. So, here is my question: Will the train be more difficult to pull/slide along the track with standard round wheels or with flats cut on the wheels????