The quality of light

I’ve never really understood the difference between ordinary trains and Country Link trains. I do know a few things:

• You can’t just get on any old Country Link train and sit anywhere.
• Country Link trains don’t go to the normal places that city people go to.
• When you’re under the bridge on Styx Creek and one goes over the top it sounds different to the ones that go to Telarah, or coal trains, or goods trains.
• They have tinted windows so when I’m down the creek and one goes past (a regular occurrence in the afternoon as I tend to walk Jambo about the same time one heads north) and the train decides to pause for a breather on the bridge a lovely light casts itself down into the the concrete. Here’s proof.