Initial experiments with static grass. Peco applicator and 6mm 'autumn grass' in one uniform coat is all I've done so far:

It looks ok - I actually think it looks a lot better in that photo than it does in real life, but its just the first run so it should improve once I start layering different lengths and colours into it.

I have also added the brickwork patterned card to the platform edges, polyfilla'd the screw heads and ballasted the three station tracks, but none of that is particularly photo-worthy just yet.