The Train to Impossible Places (Train to Impossible Places #1) by P. G. Bell

Shortlisted for the Waterstones Children's Book Prize 2019.
"Great fun!" - Philip Reeve, author of Mortal Engines
"Rip-roaring inventive adventure" - The Independent

When Suzy hears a strange noise in the middle of the night, she creeps downstairs to find a train roaring through her house. But this is no ordinary train. This is the magical delivery express for the Union of Impossible Places.

Whisked on board by a troll-boy, Suzy's world is turned upside down when she's asked to deliver a cursed package to a fearsome sorceress. And quite suddenly, Suzy realizes the fate of the Impossible Places is in her hands...