foamer
n.— «Kaye Lynn Webb said railroad lovers are usually referred to as foamers because they foam at the mouth because they get so excited about railroads. “We are two of the biggest foamers you will ever see,” she said. “We love railroads. Always have and always will.”» —“Webb museum opens in Carona” by Stacy M. Drennan Morning Sun (Pittsburg, Kan.) July 4, 2004. (source: Double-Tongued Dictionary)