Final answer:
Harry and the Weasleys used an old junk that Percy referred to as a station wagon to travel to the Burrow for Christmas 1996. The mode of transportation was a magical method of gliding through the darkness.
Step-by-step explanation:
When Harry and the Weasleys went to the Burrow for Christmas 1996, they travelled in an old junk that Percy referred to as a station wagon. This mode of transportation was used to glide through the darkness towards the break between two mountains.
Based on the provided information, it can be inferred that the Weasleys used a magical method of transportation.