Caribou A5

It's like Gravel Pit, but C unlocks when A or B is captured.

Designed with a focus on rotating between A and B quickly, and on trimming the Steel meta to its bare essentials.

EArkham's Snowycoast Pack
Fruity Snacks' End of the Line Pack
Fruity Snacks and Ravidge's Snow Shovels
The Swamp Pack
The Frontline Pack
Asd417's Improved Vault Door
14bit's Sticky Stopper
AsG_Alligator's large pipes, vent fan, and hopper traincar
Void's Snowblends