Northern Ireland RTB Leyland PS1 A8560, GZ7628, of 1947, B34R body by the operator

NIRTB ceased to exist a year later, having been formed in 1935 to effectively operate all road transport in Northern Ireland except for the cross border Erne Bus Co and the Londonderry & Lough Swilly Railway Co (which runs buses in Derry and Co Donegal to this day).
The Ulster Transport Authority was formed in 1948 to take over the NIRTB and the main line railways. A8560, one of hundreds of broadly similar buses, outlived even the UTA to become (briefly) part of the Ulsterbus fleet in 1967, when it was withdrawn.

Photo taken by Iain Stewart, Saturday 28 April 2007, Irish Transport Trust's annual rally at Cultra