Books are a great resource both for information and inspiration! Unlike years ago, finding 2nd hand books is fairly straightforward. Sites such as Biblio and Abebooks make it easy, so titles that I regret not buying can be snapped up. I’d passed by the Flying Snail book a few times but kept coming back to it. One you probably should look for, given your interests, is Clements and McMahon - ‘Locomotives of the GSR’.