When it may be necessary, in order to enable the corporation to acquire and construct proper railroad terminal facilities in any town or city, or to connect such facilities with the tracks of any railroad company with whom the corporation may have contracted to furnish such facilities, the corporation, with the consent of the proper authorities of such town or city, shall have the right to lay and operate a track or tracks across or along or over or under such of the streets or alleys of such town or city as may be necessary for that purpose; and the corporation may also, with such consent, construct such passenger or freight depots or stations across or along, over or under, any such street or alley when it shall be necessary in order to furnish proper railroad terminal facilities in the town or city. But no street or alley of any town or city shall be obstructed or interfered with until the consent of the proper authorities of the town or city shall have been first obtained.