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A control system includes an energy management system and an isolation control system. The energy management system generates a trip plan that designates operational settings of a vehicle system having powered units that generate tractive effort to propel the vehicle system. The energy management sy

A control system includes an energy management system and an isolation control system. The energy management system generates a trip plan that designates operational settings of a vehicle system having powered units that generate tractive effort to propel the vehicle system. The energy management system determines a tractive effort capability of the vehicle system and a demanded tractive effort of a trip. The energy management system identifies a tractive effort difference between the tractive effort capability of the vehicle system and the demanded tractive effort of the trip and selects at least one of the powered units based on the tractive effort difference. The isolation module remotely turns the selected powered unit to an OFF mode such that the vehicle system is propelled along the route during the trip by the powered units other than the selected powered unit.

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1. A control system comprising: an energy management system configured to generate a trip plan that designates operational settings of a vehicle system having plural powered units interconnected with one another that generate tractive effort to propel the vehicle system along a route for a trip, the

1. A control system comprising: an energy management system configured to generate a trip plan that designates operational settings of a vehicle system having plural powered units interconnected with one another that generate tractive effort to propel the vehicle system along a route for a trip, the energy management system also configured to determine a tractive effort capability of the vehicle system and a demanded tractive effort of the trip, the tractive effort capability representative of the tractive effort that the powered units are capable of providing to propel the vehicle system, the demanded tractive effort representative of the tractive effort that is calculated to be used for actually propelling the vehicle system along the route for the trip according to the trip plan; andan isolation control system configured to be communicatively coupled with the energy management system and to remotely turn one or more of the powered units to an OFF mode,wherein the energy management system also is configured to identify a tractive effort difference between the tractive effort capability of the vehicle system and the demanded tractive effort of the trip and to select at least one of the powered units as a selected powered unit based on the tractive effort difference, andwherein the isolation control system also is configured to remotely turn the selected powered unit to the OFF mode such that the vehicle system is propelled along the route during the trip by the powered units other than the selected powered unit. 2. The control system of claim 1, wherein the isolation control system is configured to be disposed onboard a first powered unit of the powered units in the vehicle system and to remotely turn the selected powered unit that is located remote from the first powered unit in the vehicle system to the OFF mode. 3. The control system of claim 1, wherein the energy management system is configured to determine respective portions of the tractive effort capability that are provided by the powered units and to select the selected powered unit to be turned to the OFF mode based on a comparison between the tractive effort difference and the portions of the tractive effort capability that are provided by the powered units. 4. The control system of claim 1, wherein the tractive effort difference represents an excess tractive effort by which the tractive effort capability is greater than the demanded tractive effort. 5. The control system of claim 1, wherein the energy management system is configured to select the selected powered unit and the isolation control system is configured to remotely turn the selected powered unit to the OFF mode prior to the vehicle system starting the trip such that the selected powered unit is in the OFF mode from the start of the trip through at least until the trip is completed. 6. The control system of claim 1, wherein the trip plan designates the operational settings of the vehicle system as a function of at least one of distance along the route or time elapsed during the trip such that at least one of emissions generated or fuel consumed by the vehicle system is reduced by operating according to the trip plan during the trip relative to the vehicle system operating according to other operational settings of another, different trip plan. 7. The control system of claim 1, wherein the selected powered unit continues to operate to generate electric current for one or more electric loads of the at least one of the powered units without producing tractive effort when in the OFF mode. 8. The control system of claim 1, wherein the operational settings of the trip plan include at least one of throttle settings, speeds, brake settings, or power output settings of the powered units. 9. A method comprising: determining a tractive effort capability of a vehicle system having plural powered units that generate tractive effort to propel the vehicle system and a demanded tractive effort of a trip, the tractive effort capability representative of the tractive effort that the powered units are capable of providing to propel the vehicle system, the demanded tractive effort representative of the tractive effort that is calculated to be used for actually propelling the vehicle system along a route for the trip according to a trip plan, the trip plan designating operational settings of the vehicle system to propel the vehicle system along the route for the trip;identifying a tractive effort difference between the tractive effort capability of the vehicle system and the demanded tractive effort of the trip;selecting at least one of the powered units as a selected powered unit based on the tractive effort difference; andremotely turning the selected powered unit to an OFF mode such that the vehicle system is propelled along the route during the trip by the powered units other than the selected powered unit. 10. The method of claim 9, wherein remotely turning the selected powered unit to the OFF mode is performed by an isolation control system disposed onboard a first powered unit of the powered units in the vehicle system to remotely turn off the selected powered unit that is located remote from the first powered unit in the vehicle system. 11. The method of claim 9, further comprising determining respective portions of the tractive effort capability that are provided by the powered units, wherein the selected powered unit is selected based on a comparison between the tractive effort difference and the portions of the tractive effort capability that are provided by the powered units. 12. The method of claim 9, wherein the tractive effort difference represents an excess tractive effort by which the tractive effort capability is greater than the demanded tractive effort. 13. The method of claim 9, wherein selecting the at least one of the powered units and remotely turning the selected powered unit to the OFF mode is performed prior to the vehicle system starting the trip such that the selected powered unit is in the OFF mode from the start of the trip through at least until the trip is completed. 14. The method of claim 9, wherein the trip plan designates the operational settings of the vehicle system as a function of at least one of distance along the route or time elapsed during the trip such that at least one of emissions generated or fuel consumed by the vehicle system is reduced by operating according to the trip plan during the trip relative to the vehicle system operating according to other operational settings of another, different trip plan. 15. The method of claim 9, wherein the operational settings of the trip plan include at least one of throttle settings, speeds, brake settings, or power output settings of the powered units. 16. A control system comprising: an energy management system configured to generate a trip plan that designates operational settings of a vehicle system having plural powered units interconnected with one another that generate tractive effort to propel the vehicle system along a route for a trip, each of the powered units associated with a respective tractive effort capability representative of a maximum horsepower that can be produced by the powered unit during travel;an isolation control system configured to be communicatively coupled with the energy management system and to remotely turn one or more of the powered units to an OFF mode,wherein the energy management system also is configured to determine a total tractive effort capability of the powered units in the vehicle system and a demanded tractive effort representative of the tractive effort that is calculated to be used for actually propelling the vehicle system along the route for the trip according to the trip plan, andwherein the energy management system is configured to select a first powered unit from the powered units based on an excess of the total tractive effort capability of the powered units over the demanded tractive effort of the trip, and the isolation control system is configured to remotely turn the first powered unit to an OFF mode such that the vehicle system is propelled along the route during the trip without tractive effort from the first powered unit. 17. The control system of claim 16, wherein the energy management system is configured to select the first powered unit from the powered units of the vehicle system based on a comparison between the excess of the tractive effort capability and the tractive effort capability of each of the powered units. 18. The control system of claim 16, wherein the energy management system is configured to select the first powered unit and the isolation control system is configured to remotely turn the first powered unit to the OFF mode prior to the vehicle system starting the trip. 19. The control system of claim 16, wherein the trip plan designates the operational settings of the vehicle system as a function of at least one of distance along the route or time elapsed during the trip such that at least one of emissions generated or fuel consumed by the vehicle system is reduced by operating according to the trip plan during the trip relative to the vehicle system operating according to other operational settings of another, different trip plan. 20. The control system of claim 16, wherein the operational settings of the trip plan include at least one of throttle settings, speeds, brake settings, or power output settings of the powered units.