My DS loved the battery operated trains on Brio, especially Thomas. There's bit (points?) with a lever that you can pull to stop the trains. when you push the lever the other way they go again. I know a lot of children prefer pushing the trains round, but mine is a bit of a lazy lump!
RAF bases are very noisy - we lived with 3 squadrons of Tornados' regular visits from Eurofighter and countless other planes every day for 5 years. Wait till they start flying at 2am on "training" and waken your Ds up!
The Brio boat is brilliant because you can use it to bridge gaps in track layout that hasn't worked out, and the trains go inside it (engine and two carriages worth). As you draw up to the boat docking bit, the door opens and the train runs straight back out onto track. It's fab.