Swanage Railway: the next journey?

On the last day of holidays in Dorset, I saw this poster at the Weymouth railway station. It was of course advertising Swanage Railway, which we did not have time to see. In fact, we did not even think of going there at all. I have heard about it before, but I don't know all that much about it. In fact, I know very little. It is on the Isle of Purbeck and it has steam trains, this is pretty much all I need to know. I know I would have had fun there. Wolfie too. My wife, maybe not so much. We might not go to Dorset again for our next holidays, but this is now on my bucket list.