ABANDONED. YA Sci Fi/ Fantasy. Set in a dystopian future where everyone lives in moving cities. Story is about breaking the class divide between the lower and upper levels. Read in late 1990s/early 2000s. Not Mortal Engines.

[Frankie de Chenu]

Hi! Really struggling to remember this book, it's NOT Mortal Engines but watching Mortal Engines is what has made me remember it. At my best guess I likely read it in the late 1990s or early 2000s so my memory of the storyline is very vague. I remember that it was a dystopian future book where everyone lived in giant cities on wheels. I think the main protagonist was female and there was a romance theme. There was a class divide between the lower levels, where people lived in poor conditions and kept the city running and moving, and the upper levels where people lived in luxury. I think there may have been the word 'song' in the title but I'm not certain (Plainsong rang a bell during my search but it was definitely not that!). Sorry it's so vague but I probably read it around 20 years ago!

[Tova]

Probably not your book because the MC is a man, but I will leave it here, just in case: Roller Coaster World.

[Tova]

Worldshaker sounds a bit more likely, but it's from 2009.

[Kris]

Here's the Google Books preview of Tova's suggestion - Roller Coaster World by Kenneth Bulmer:

https://books.google.com/books?id=KY4... There are different cover images.

[Rainbowheart]

MC is male, but The Inverted World?

[Kris]

Frankie (OP) left the group. Moving to Abandoned folder.