All of the trains are Electrical Multiple Units, which were first used in 1893 on the Liverpool Overhead Railway. EMUs are used all over the world, mainly as surburban passanger trains, but they are sometimes designed for mail or other luggage. They're pretty quiet and low-pollution, making them great for in the city where people are living.
These clunkoramas are older than me, and it shows! Some of them still have the old turn-handle on them! The seat layout is awful, and most of them are filthy. I always cringe a little when I see these rickity old things heading towards me.
These things also make me feel a tad apprehensive when they approach. They're not as bad as the EMUs, but they have a similar seat layout which is annoying. Thankfully these I don't see too often.
The 220s are pretty good, they have a nicer seat layout including more disabled spaces, meaning the front seat of the three carriages has a bit more legroom (provided no one takes the seat in front of you). They have a nicer decor as well.
I LOVE getting these trains - the front seat has a bar in front of it, making a little footrest if you're lucky enough to snag the seat. The decor is lovely too, and the back of the seats are higher, making leaning back and relaxing much easier.
Images from www.queenslandrail.com.au