[Is there any way to run onUpdate function, during scrub?]

Thank you for your explanation @mvaneijgen . And sorry for the inconvenience for the last explanation. 

[Is there any way to run onUpdate function, during scrub?]

const animation = gsap.to(node, {
      x: width,
      scrollTrigger: {
        trigger: '#our_clients_section',
        start: 'center bottom',
        end: 'bottom top',
        scrub: 3,
        onUpdate: (self) => {
          distanceTrainCrossed = parseInt(self.animation?._targets[0]._gsap.x)
        }
      }
    })

I need the distanceTrainCrossed sync with train object latest position, but as there is scrub enabled of 3s. During the scrub, the onUpdate function not firing. so i can't get the latest position.