I don't know what it takes to readily ID any of the many variations of White's Thrush there are.
This individual showed up at the King's Park in Greater Bangkok area. It has stockier bill then the Scaly Thrush (Zoothera dauma) and instead of 12 tail feathers it has 14. It is also said to be more pale in the plumage but apparently that is not a reliable feature. So here is the Zoothera auera aka White's Thrush.