Establishing the timeline

Bucky Barnes never fell from the train. He and Steve Rogers thought the end of the line was when the Valkyrie plunged into arctic ice.

They were wrong.

This story kinda sorta generally mosies along the storylines established in canon, but it's more like canon's within hailing distance, they're friends, not close though, you know? Tags to be added as the story develops. The history is actually pretty accurate.