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The set is based on when Harry first runs through the barier at platform 9 & 3/4 in Harry Potter and the Philosopher's Stone.
The Trolley Edit
The Trolley has a trunk with Hedwig on top of it.It was given for free at Toys R us and WHSmith as a promotional from The Sun on 15/10/2011.
It was also available to purchase from Toys R Us in the United States.
In the UK, this set was included with some Nintendo DS and 3DS versions of LEGO Harry Potter: Years 5-7.