When I look at Bucky’s face in this scene, I just see terror.
He’s trapped on the same train as Arnim Zola, and he’s terrified of being recaptured and experimented on again.
Ever since his rescue from the Hydra facility, there’ve been signs that he’s not ok.
Bucky stops faking a smile the moment Steve turns away from him.
At the bar when Steve is recruiting the Howling Commandos, Bucky sits apart from everyone, tossing back whiskey like someone struggling with bad memories. He’s already got the thousand yard stare. And when he talks to Steve, it’s with an edge of false bravado.
When Steve first finds Bucky, he was repeating his name, rank and serial number like a mantra, a sign that he’d probably been interrogated and/or tortured. Another blogger pointed out that the bruises on his cheek and forehead look like they were caused by the equipment used to wipe him in CATWS. Zola, in all likelihood, had already begun the process of breaking Bucky down.
Can you imagine the courage it took for Bucky to follow Steve onto that train?
When Bucky said “I’m with you to the end of the line,” he meant every single word.
And yet he manages to pass it off with the Coney Island Cyclone joke! You KNOW Bucky just wants to vomit, and not from the ride down to the train, but from what’s waiting for him there.