But the passage of time also has some upsides. It has allowed some of the proliferation of emergent phenomena under Generations 345/3/6 to start to become a bit better organised. In particular the animation below shows the range of trails left by 1/2 speed double track erosion:

From left: Delta engine ahead of naked-trackless split, proof of existence of an infinite set of ships, a relatively rare sparse block trail laying engine, more common asymmetric and symmetric block trail laying engines, shorter gapless track erosion which maintains longer track laying engines, 5 on gap side erosion of a tagalonged triple track, common enough sparse trail produced by similar erosion but across all three tracks.