I do not wish to be accused of spamming so I won't include any links or go into too much detail but my very good friend, Roy Harper, used to be a volunteer on the famous Ffestiniog Narrow Guage Railway in the United Kingdom and he has written a booklet about his experiences. He used to actually drive the steam trains and maintain the engines. He has included some great images in the booklet too and says that after reading it you would actually know how to drive a steam train!
If anyone is interested then please email me. I hope the moderators are O.K. with my email.