Thomas the Tank Engine & Friends: Thomas the Train 'Sir Topham Jack in the Box' Thomas the Tank Engine Sir Topham Jack in the Box. This decorative tin box plays "Pop Goes The Weasel" and when you turn the handle, Sir Topham Hatt pops up. Measures a little over 5" square when closed. 6.5" x 5.75" x 5.75" Surrounded with graphics of thomas the train. Ages over 18 mos and over.