Travel guides are generally useless when it comes to trains. Guides are for tourists, not travellers.
I'm just off to Andalusia by train. (That's why I came here, and now know not to buy this book.) We travel with RailBookers.
They know what they are about and have taken us all over Europe. The key is in the name. RailBookers. Not some poxy bucket shop that throws you at the mercies of EasyRyanJetAir.