Dutch door

When the top half was open, they also allowed a breeze, but stopped the wind from blowing dirt into the house.

[1] Dutch doors were often incorporated into the design of passenger railcars in North America to allow crewmen to interact with employees outside or to carry out visual inspections.

In Canada, changes to operating rules[ambiguous] rendered the Dutch doors obsolete, although older rolling stock retains them.

They were designed to keep poultry and pigs from entering the house, as well as allowing air and sunlight into the usually dark and smoky cottages.

[3][4][5][6][7] They have been used internally in residential care homes to control wandering but maintain a line of sight[8] and in child-care environments, but in that context, there are risks of finger-trapping and concerns over fire regulations.