Sumner Tunnel: Washing Machine, Watering Truck. Item 37-10, Sumner Tunnel (East Boston), 7/1/35, Bridge and Ferry Photographs circa 1926-1947 (Collection # 5010.004), City of Boston Archives
I love the handwritten caption: “Washing Machine – Watering Truck and all commercial parts – improvised by Tunnel personnel.” It’s a portrait of public sector innovation.