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So far, Lego piece 6380020 (pic related) is only used in the $500 Hogwarts Express Collectors' Edition set. It would be nice to see a Union Pacific Big Boy set using this piece. The Hall Class locomotives the Hogwarts Express is based on is a 4-6-0, where as the Big Boy is a 4-8-8-4. A Lego Big Boy will need 16 instances of piece 6380020 and 11 instances of of piece 6236464 for the loco and tender combined. By comparison, Hogwarts Express Collectors' Edition has only 6 instances of piece 6380020 and 5 instances of piece 6236464 (9 if you count the rolling stock including the passenger car). Since the Union Pacific Big Boy is one of the most iconic trains of all time, The Big Boy would make for a worthy addition to the Lego Icons theme.
