Unity check collider layer

 function OnCollisionEnter(collision : Collision)
 {
     if (collision.collider.gameObject.layer == LayerMask.NameToLayer("LAYER_NAME"))
     {
          Debug.Log("Touched a rail");
     }
 }

Checking a gamobjects layer

if(gameObject.layer == LayerMask.NameToLayer("LAYER_NAME")){}

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