You can download the Lokprogrammer software from the ESU website for free and play around with it before you even buy the programmer itself. When you download the software it includes several sound template libraries which contain various engine, horn, brake, whistle sounds which you can use to build your own soundfiles from scratch. These libraries don't contain the Irish-specific sounds but if you download the 201 and 071 sound files you can copy these sounds to the libraries on your PC. It's then a fairly simple job to download whatever US sound file that has the engine sound you need then just swap out whatever sounds you want for Irish ones.