Trying out DCC in 00 Gauge
Lego trains (and Lego as a modelling tool generally)
Docks / marshalling yards / wagons (especially tank wagons)
Cliff railways
Heritage / preserved railways
Odd and interesting rail vehicles (e.g. steam cranes)
Garden railways (don't have one but like looking at other people's)
But those of us who mark dissertations can spot padding a mile away! Go back into your literature references and add more depth or into your findings and ditto. Leander is right too.
