:think: I finished reading the book a few days ago, and I have to admit that I have mixed feelings about it.
On the one hand, the story's development was well-paced, with Ned SImnel's son's tinkering leading to Harry snapping up the first application of the train, the initial crowds and Vetinari's suspicion, the dwarf grags getting desperate, the railway expansion, the delver attacks, the coup, the pressure to apply the ambitious Uberwald line, and the long struggle to get the Low King back home for a counter-coup with the new train. On that note, I particularly liked the misdirection, gambits, and occasional improvised moments in the last sequence especially. It was also fascinating to get a look at the train development and politics, watch characters react to it, and see the characters try to juggle problems and predictions among themselves.
There were a few moments of good humour, and a few more smile-inducing moments. Introducing trains to Discworld introduces a lot of potential, and it's used to good effect, especially the early scenes depicting Iron Girder capturing the public imagination. The goblin society, including the division between Morporkian and Quirmian goblins, was fun to read about, and some characters like Albrechtson, the Low King, the golem horse, the Marquis, Ardent, Of the Twilight the Darkness, and Harry King, were interesting to see as they staked positions and interacted with each other. Overall, it's not a book I regret reading.
On the other hand, it has several flaws which range from merely being below Terry's usual standard to being almost story-wrecking. There's too much telling over showing, too much summarizing, too many tangents and scenes that come out of nowhere and then vanish never to be mentioned again, and (so it seems) too much jumping around from perspective to perspective and scene to scene, even for a Discworld book. The result is a strange sense of distance and alienation where before I would have been fully immersed in the story and cast. Many interesting plot threads with dramatic conflicts are either resolved too quickly or undermined, which hurts the climax especially as it takes a good chunk of any suspense with it. Unfortunately, a lot of the humour also seems to be missing; I certainly laughed much less frequently than I did with earlier books, even
Thud!, and smiles were also few and far between. Frequently, I found myself asking whether certain passages would have been rejected if submitted to a publisher by a newcomer.
Moreover, it's like raisindot says: the overall style is straying away from Discworld's usual wit and flair, and everything seems too Pollyannaish and idealistic. As a result, and in spite of the darker moments, it never convinced me that any major resistance was going to be offered by the antagonists that the protagonists weren't going to bat aside with ease or luck out of (such as the gnomes arriving to help with the water). It feels too pedestrian. Lastly, a good chunk of the cast seem either flat (Simnel, regrettably, becomes a recurring one-note with no particularly compelling characteristics beyond his backstory) or wildly all over the place (Harry King is a shrewd business tough one moment, an openly emotional nice guy the next, which is especially jarring when he does it in front of Moist, of all people).
:| There's a good, top-notch Discworld book in there trying to get out, but it hasn't fully succeeded because the flaws too often defuse the (still nicely entertaining) enjoyments. Overall, I'd give it a 6 or a 7 out of 10: above average, but definitely not outstanding.