|"To know the town one must know Main Street; to understand Main Street, one must understand the River." Irvington Historic District is eligible under Criterion A in the area of Industry an example of a dense village commercial and residential historic core that became viable largely in the mid-19th century because of the trajectory of industry relating to three potent transportation routes: the Hudson River, the Hudson River Railroad (later, New York Central) and Broadway (Albany Post Road). These trade routes represent the genesis of the physical layout of the village and its social and economic underpinnings. Businesses flourished because of the influx and outflow of resources (people, money, raw materials and finished products) afforded by an active Hudson River, burgeoning new railroad and established post road, all key elements of the history, growth and sustained vitality of the Irvington Historic District. Vibrant trade associated with the Hudson River (connecting with New York City and the Erie Canal) and the emergence of the Hudson River Railroad, coupled with several prominent nearby estates, provided an enviable setting within which industry could flourish. When companies including Lord & Burnham, Pateman & Lockwood and the Cypress Lumber Company began to lay claim to the waterfront, the population of Irvington soared. Trains and roads facilitated further settlement as a suburban outpost, including new arrivals from New York City as well as outlying areas to the east and north, throughout and beyond the Town of Greenburgh.