Screenshots + imagemagic and I got this:
table
transposed
Marathon only changes (from default) "recipes/technology settings" to expensive and x4.
Dangerous changes frequency of enemy bases and evolution (pollution factor a bit, time factor times 4). I was expecting it changes 'enemy expansion' settings, but they looks the same.
Death world do the same as "marathon" and "dangerous" combined.
I wonder... how to combine marathon/DW with rail world?