In reply to Ian, a few years ago I saw a prominent photo of one of the Llandudno trams. In the write up it stated "photo of tram descending towards Llandudno." I immediately spotted this was incorrect. It was actually accending away from Llandudno. I was absolutely 100 percent sure. I knew exactly the spot the photo was taken from.
And this was in a book about the history of the tram track. Not a very good start. But I thought, oh well, never mind it's just two words wrong.
Later in a chance conversation with the then chairman of the Bala railway society I mentioned this, and that I had done nothing to correct it. He was horrified. He said in years to come in the future people will read this and be completely misled. You (me) must do something.
So I wrote to either the author or the publishers, I don't remember which. I got the distinct impression that they were not overjoyed overthe news!!