That, and there weren't actually any economy seats in the old style CTT. All business class only. Never had a ride in one, so can't say how good or bad they were, although new seats will generally soften up a bit as time goes on.
I travelled from Cairns on the Spirit last week in "Premium Economy" class. The train was very impressive as a piece of engineering technology, but as a means of conveying passengers long distances, it leaves a lot to be desired. The main problem was the seats.
They are now trimmed in leather (easier to clean), but the seat cushion is completely flat, with no bolster on the front edge so that my backside kept moving forward with the motion of the train and I had to continually adjust my position. I don't know if the ergonomics expert who designed the seats ever sat in them for any length of time, but if you recline the seat back, the head rest is so far back that you have to lean your head right back without a pillow.
There doesn't appear to be much lower back support - I used a rolled up blanket to allow me some comfort when I tried to sleep. In addition, there are no footrests (probably some obscure H&S requirement) - which means that you tend to slip forward in the seat.
In the end, my seat companion and I resorted to sitting up sleeping with our elbows on the tray table, heads supported on our hands.
He had travelled on the CTT before the Spirit was introduced, in business class which had more comfortable fabric seats (with footrests) in a 2 plus 1 configuration instead of the current 2 plus 2 setup.
My carriage was the PWD one which had single seats for disabled passengers and room for wheelchairs and luggage at the rear section of the carriage.
With respect to the rest of the journey, the Club Car was good - open all hours - prices reasonable. The choice of video entertainment was good except that there is no longer any video of the train track. I could not get anyone to explain what the USB port in the side of the seat was for next to the headphone jack. The view from the large windows is excellent and the toilets and showers were roomy and clean. The overhead luggage bins were large enough to accomodate an overnight bag and my laptop bag
I would suggest that if you intend to travel on this train, you bring a decent pillow and a blanket, as the pillows supplied are about the size of a 1 kilo bag of flour and just as unyielding and there are not always enough blankets.