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It doesn't bode super well for the series that in this, just the 3rd book, there is already a clear plot formula. This book goes back to the method of the first book, where the reader is treated to scenes of the criminals plotting, rather than figuring out the case with the detective.

It think with this series that works better, since really the fun part is not who the criminal is but how the detective is going to manage to use the rail system to solve it. As with the previous two books, we have the grumpy superintendent maligning methods that of course work eventually, a female witness that gives the excuse to get the detective's lady love involved a bit, and of course a train ride to apprehend the criminal in the nick of time (though the ending here was definitely a surprise)

That said, it's hard not to like train based historical mysteries... it might be a formula but it's a GOOD formula. I noted that the next book has a connection to horse racing too, which puts me in mind of Dick Francis, who somehow wrote like a million mysteries about a very narrow topic, but yet any of the ones I read will all good.