Rails movement

Hi guys i need some help i explain on pictures.

i need move objects on platform by direction example on this picture.



So it's simle the red box is a cube and gray rectanlge is the platform and i want platform move cube to arrow directions. i'm trying witih rigidbody and transform but got some errors. because if the box have rotation 90 - 90 -180 180 they move wrong direction. can u help me a clean and simple code?

 

Done:

Code (CSharp):

1.         if (_start.transform.position.x < _end.transform.position.x)
2.         {
3.             collision.gameObject.GetComponent<Rigidbody2D>().velocity = new Vector2(1f* Vector2.right.x, 0);
4.         }
5.         else
6.         {
7.             collision.gameObject.GetComponent<Rigidbody2D>().velocity = new Vector2(1f * -Vector2.right.x, 0);
8.         }

 

Is this like conveyor belt style movement? There's a Surface Effector 2D component that you can put on your platform to move rigidbodies along it automatically.