Took that from Pamly to Welli recently, the open car is great! A bit windy but well sheltered, right behind the loco.
The carriages are very nice, comfy seat, good AC, lots of food and booze available in the snack car and the full height and roof windows are petty cool. You can even listen to an audio guide of anything interesting the train passes.
Of course it was and hour and 20mins late and Palmy is possibly the worst station in the developed world.
Luggage van at one end and observation car at the other. IIRC there were 3 or 4 carriages and a snack car.