Brake van
Brake van and guard's van are terms used mainly in the UK and Australia for a railway vehicle that has a hand brake which can be applied by the guard. The equivalent North American term is caboose but a British brake van and a caboose are very different in appearance because the former usually has only four wheels while the latter usually has bogies.
Brake Van Media
British Railways "standard" brake van
A "toad" brake van of the Great Western Railway
British Rail Mark 1 coach with passenger compartments (left) and brake / luggage area (right)