He played the violin and was a model train enthusiast growing up
While working on a couple of cases, we got a glimpse into Deeks' childhood interests—including the violin and model trains. In "Patriot Acts" (Season 3, Episode 20), he was able to recognize the person of interest's expertise in the cello. In "The Livelong Day" (Season 5, Episode 7), he helped solve the case by recognizing a rare scale engine.