In case you were wondering, the Providence & Danielson handled milk in its express cars before buying a dedicated milk car. This 1903 photo of one of the express cars shows quite a lot of milk on the platform and in the background. I think this was the most common way that electric railroads handled the milk business. One account of the Meriden & Southington, however, mentioned that milk cans were carried on the open platforms of its regular passenger cars. So I guess it depended on the volume.
