If it happens from enough usage the tension pad is worn and causing the issue, then this is the repair also covered in the topic linked and then this is the direct repair parts link from MTH. https://mthtrains.com/productdisplay/ie-0000048-0
Again, really simple concept, there is a spring and a piece of plastic that intentionally rubs agains the handle motion so there is friction. Use the handle enough, that pad can wear or be out of adjustment or some combination and thus cause the very noise you indicated.