Marcella thinks it's childish to wave at the engineer of a train but she does it anyway.?

Marcella feels a mix of embarrassment and nostalgia as she waves at the engineer, recognizing the gesture as a playful connection to her childhood. Despite her belief that waving is childish, the act brings her a fleeting moment of joy and a sense of community. In that instant, she prioritizes the simple pleasure of the interaction over societal expectations. Ultimately, it reflects her desire to embrace moments of happiness, regardless of how others might perceive them.