Hi  I am not close with Hong Kong MTR...to Sha Tin. from Tsuen Wan West
You can Take the brown line of the Tsuen Wan West station.Then change at Hung Hom station from brown line to cyan line.Get off the train at Sha Tin station. It will be  33 mins  trip and it will price around 13.08 HKD.
That's was I want , Byebye.
Had a great day! Bye!