adventurous hopeful mysterious slow-paced

I just could not get into this and it was a slog.  Orient Express but make it spooky? Except I was bored the whole time.
adventurous dark emotional hopeful inspiring mysterious
adventurous mysterious reflective medium-paced
Plot or Character Driven: Plot
Strong character development: Yes
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes

Overall I enjoyed this book, but I feel like either I am missing some historical context or there is some depth missing from this narrative to make this a more impactful story. It touches on numerous themes including classism, industrial political complex, religion and more, but almost because it touches on so much, it almost touches on none of them enough. The mystery of this story is really the thread that you hang to throughout, and it is very intriguing, I just wish the execution of the themes was just as interesting 
adventurous mysterious medium-paced
adventurous challenging hopeful mysterious tense medium-paced
Plot or Character Driven: A mix
Strong character development: Complicated
Loveable characters: Complicated
Diverse cast of characters: Yes
Flaws of characters a main focus: No
adventurous mysterious medium-paced
Plot or Character Driven: A mix
Strong character development: Yes
adventurous mysterious medium-paced
Plot or Character Driven: A mix
Strong character development: Yes
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes

I was apprehensive to read this book at first due to it noting “for fans of Piranesi…”. Did not care for that book but this one was slightly better. At first, it was quite different and interesting but the longer it went on, the more bored I became. It took forever to get through and the ending was meh. 
challenging funny medium-paced
Plot or Character Driven: Plot
Strong character development: No
Loveable characters: No
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes

If you’re a fan of walking up and down trains then this is the book for you.