Method and apparatus for operating a vehicle on rails of a railroad track with an auxiliary drive assembly

1. An auxiliary drive assembly, comprising:

a hydraulic roller assembly including a roller component for engaging a tire of a vehicle to be propelled;

a hydraulic cylinder for moving said roller component from a first, unengaged position to a second, engaged position; and

a motor operatively connected to said roller component so that said roller component rotates and imparts a corresponding rotary force to the tire of the vehicle; and

wherein said motor is a hydraulic motor and is powered by an engine of the vehicle to be propelled.

2. The auxiliary drive assembly of claim 1 , wherein a first end of the drive assembly is attached to a frame of the vehicle to be driven and a second end is attached to said hydraulic roller assembly.

3. The auxiliary drive assembly of claim 1 , wherein said roller component is a grooved cylindrical drum for engaging rear tires of a vehicle to be driven.

4. The auxiliary drive assembly of claim 1 , wherein said hydraulic motor is variable so that speed and direction can be adjusted.

5. The auxiliary drive assembly of claim 1 , wherein said hydraulic cylinder is disposed between two mounting brackets.

6. The auxiliary drive assembly of claim 1 , further comprising a hydraulic flow control valve for controlling extension and retraction of the piston of said hydraulic cylinder.

7. The auxiliary drive assembly of claim 1 , wherein a control unit is disposed at a position accessible by an operator of heavy duty equipment.

8. A method of operating a vehicle, comprising the steps of:

providing an auxiliary drive assembly suspended below a frame of a vehicle to be driven including a roller component for engaging a tire of the vehicle;

placing the vehicle on railroad tracks so that tires of the vehicle engage the tracks; and

extending the roller component so that the roller component engages the tire;

rotating the roller component so that the roller component imparts a corresponding rotary force to the tire of the vehicle.

9. The method of claim 8 , including the step of:

placing the vehicle in neutral prior to the step of extending the roller component.

10. The method of claim 8 , including the step of rotating the roller component in a counter clockwise direction and thereby causing the tires of the vehicle to rotate in a clockwise direction.

11. The method of claim 8 , including the step of:

moving the roller component from a first, unengaged position to a second, engaged position through operation of a hydraulic cylinder.

12. The method of claim 8 , including the step of:

driving the roller component through a chain drive operated by a hydraulic motor so that the roller component rotates and imparts a corresponding rotary force to the tire of the vehicle.

13. The method of claim 12 , including the step of varying the speed and direction of the hydraulic motor so that speed and direction of the roller component is adjusted.

14. A vehicle for driving on the road and railroad tracks, comprising:

a main chassis for supporting a vehicle body and corresponding tires, said tires including portions to be driven on rails of a railroad track;

a main engine for propelling the vehicle;

an auxiliary drive suspended below said vehicle body, said auxiliary drive including a hydraulic roller assembly having a roller component for engaging a component of a vehicle to be propelled, a hydraulic cylinder for moving said roller component from a first, unengaged position to a second, engaged position, and a hydraulic motor operatively connected to a chain drive for driving said roller component so that said roller component rotates and imparts a corresponding rotary force to the component of the vehicle.

15. The vehicle of claim 14 , wherein said hydraulic motor is powered by said main engine.

16. The vehicle of claim 14 , wherein a first end of the drive assembly is attached to said vehicle body and a second end is attached to said hydraulic roller assembly.

17. The vehicle of claim 14 , wherein said roller component is a grooved cylindrical drum for engaging rear tires of the vehicle.

18. The vehicle of claim 17 , wherein said drum is metal.

19. The vehicle of claim 14 , wherein said hydraulic motor is variable so that speed and direction can be adjusted.

20. The vehicle of claim 14 , wherein said hydraulic cylinder is disposed between two mounting brackets.

21. The vehicle of claim 14 , further comprising a hydraulic flow control valve for controlling said hydraulic cylinder.

22. The vehicle of claim 14 , wherein a control box is disposed at a position accessible by an operator of the vehicle.

23. The vehicle of claim 14 , further comprising a set of retractable front and rear railroad wheels operatively connected to said main chassis for engaging rails of railroad tracks and for thereby lifting the vehicle front wheels above the rails and permitting the vehicle rear wheels to engage the railroad track rails.

24. An auxiliary drive assembly, comprising:

a hydraulic roller assembly including a roller component for engaging a tire of a vehicle to be propelled;

a hydraulic cylinder for moving said roller component from a first, unengaged position to a second, engaged position; and

a motor operatively connected to said roller component so that said roller component rotates and imparts a corresponding rotary force to the tire of the vehicle; and

wherein said motor is a hydraulic motor and a chain drive extends between and is operatively associated with said hydraulic motor and said roller component so that operation of said hydraulic motor causes corresponding rotation of said roller component.