Yorkie, it still implies that you would prefer to have proof readers who work on the railway.
I don't know if that is your intention, but it doesn't differentiate between working on, or being knowledgable about fares. Do you want people who are knowledgeable about fares? Or just railway workers who are knowledgeable about fares?
I don't think it's a bad idea. There are some people on here who are very knowledgeable indeed, but have no idea on how to communicate appropriately with anyone but those who have a similar level of knowledge. I certainly think amongst some that there is an element of being wanting to be seen to know the most/everything, rather than assessing the needs of the person seeking assistance and posting an appropriate response. This is the kind of thing that probably puts people off asking for help.
For example, recently, someone simply asked if they could travel from A-B via C. In response, someone gave a full and unabridged rundown of how to use the NRG to find the answer. Understandably, the person was confused. All that was required was a quick "no" and a brief explanation why, which makes sense. It's not uncommon to see this kind of thing happen on here. People shouldn't have to feel like they need to possess a huge amount of knowledge before asking a simple question. So why do some people's replies make this the case? I'm certain that the FTR section is not trying to be exclusive or cliquey so perhaps this sort of thing should be reined in?
Many railway staff have first hand customer service experience so are well placed to understand how to communicate with a variety of customers, whether they be knowledgeable or travelling on the railway for the first time. lyndhurst25 made a good point about the use of jargon. In my time, not one person who wanted an excess asked for an "excess." They'd ask for an upgrade, an extension or just to change the ticket. It's fair to say that very few people actually know what an excess fare is.
The combination of input from knowledgeable people and good customer service perspective from those with experience I feel would be great for a fares FAQ. Some people have both skills, some have more than one than the other. Although that said, I hope that veritable and publicly accessible sources are being used to compile the information, i.e not The Manual!