System and method of vehicle system control

A method comprising:

• obtaining an off-board-based input speed of a vehicle system traveling along a route, the off-board-based input speed obtained from data provided by an off-board device disposed off the vehicle system;
• determining a rotation speed of a first wheel of the vehicle system;
• calculating an estimated diameter of the first wheel based on the off-board-based input speed and the rotation speed during travel of the vehicle system along the route;
• and
• at least one of:
• modifying an operator-measured reference diameter of the first wheel to match or be closer to the estimated diameter, wherein the operator-measured reference diameter is used to calculate an onboard-based speed of the vehicle system and the onboard-based speed of the vehicle system is used to control tractive effort generated by the vehicle system;
• alerting an operator of the vehicle system to measure the operator-measured reference diameter responsive to the estimated diameter differing from the operator-measured reference diameter by at least a non-zero threshold distance;
• alerting the operator of the vehicle system that an inflated pressure of the first wheel is decreasing;
• alerting the operator of the vehicle system that the inflated pressure of the first wheel indicates an impending flat tire;
• or
• alerting the operator of the vehicle system that the inflated pressure of the first wheel indicates that the first wheel is flat.