Wheel out of roundness (oval geometry) on wheel-rail forces on perfect-even track

The green line next to axle-box(left primary suspension spring) demonstrates the variation in force between wheel-rail forces as the wheel tape circle with higher radius (+2 mm radius) touches the rail surface. The diagrams with red and green color illustrate the variation in wheel vertical forces to the rail and the wheel vertical displacement respectively. For simplicity, the rail is considered without any irregularity or un-evenness.