[Cordelia Brown]

Oh and then when you want the shape in the line to change (ie orange trianlgle to purple rectanlge) just do this as you normally would with a shape (keyframe change shape path and fill colour) at the desired time. Echo will change the shapes progressively down the line.

[Cordelia Brown]

So I ended up figuring it out myself for anyone who is interested…

The lines were coming in from the left of screen.

I made a shape for each line (eg orange triangle).

Then I pasted the path that I wanted them to travel along onto their position value (making sure their anchor point was centered).

Then right click > trransform > auto-orient > orient to path

This key frames the shape moving along the path.

Then apply Echo effect (Time>echo) and adjust the setting to suit desired spacing and amount of repetitions needed.

Done!