Working on gathering the Movement Costs without/with Progressive Era units or higher for each Terrain type. Getting some odd data in that I'm getting different amounts for the same type Terrain like 5 and 6 for Broken Ground and 9 or 12 for Swamp, not sure what to make of this. Also noticed if the enemy has PE units or higher then the "penalty" counts towards your units as well even if you have no PE units or higher in your army. Still gathering data, will update as I can.
Barbed Wire /6
Broken Ground /5, 6
Bush 3/4.5
Crater /
Entrenchment /6
Forest 3/4.5
Hills 4/4.5, 6
House /6
Lake /3
Plains 2/3
Rocks 4/4.5, 6
Rubble /9
Swamp 6/9, 12
Trench /6