Eric (season 7)

Eric is a friend of Sheldon whom he meets on a train ride to Napa Valley on Valentine's Day. He loves trains as much as Sheldon. After a box landed on his head while working at UPS, he went on disability and rides vintage trains. His train knowldege is quite extensive while his social skills are less than Sheldon's. Sheldon invites him to join him and Amy on their Valentine's Day dinner to her annnoyance.