There's some LMS NCC stock at Whitehead, some of which is used on train rides within the site. 68 was overhauled not long ago http://www.steamtrainsireland.com/photonews/110608/index.html#68
They also refurbished diner 87 recently. Whitehead has other vehicles of GNR(I) and GSWR origin.
The Dublin based Heritage set is a mixture of 2 CIÉ Laminates, 2 CIÉ Park Royals, a CIÉ 24xx series diner, a GNR(I) diner, a GSR Bredin side corridor, a GNR(B) Brake 3rd, a GSWR side corridor and also obviously GSWR State Saloon 351.
Last outing of a Heritage vehicle so far was Park Royal 1419 on the 2010 Santas.