shotgun shack, shotgun house, railroad flat, etc

[Mullins, Bill]

>> Shotgun shack (Not in OED)
>> Shotgun house (Not in OED)
>
>Actually, both are in OED, covered by _shot-gun_ sense 3.b.,
>"Designating a house or other building with rooms set in a
>line on either side of a long central hallway," which has
>cites for ~ dwelling house, ~ building, ~ house, ~ shanty,
>and ~ shack.

Whoops!! My bad . . .