There's already a tutorial in the 'Site News & Help' section:
http://www.irishrailwaymodeller.com/showthread.php/76-Embedding-images-uploaded-to-a-3rd-party-image-host
Express Models have something similar in their range:
http://www.expressmodels.co.uk/acatalog/Scenic_Effects.html
(a little over halfway down the page)
Your first port of call should be Des Coakham's 'Irish Broad Gauge Carriages', which includes some CIÉ stock. It's been ages since I've looked through it, so I can't recall exactly what he covers in it.
Had a few Duvels alright... and quite a few other Belgian beers, too!
Something I only learned after I returned home is that Belgium has the densest rail network in the world.
My preferred weapon of choice is Avid Media Composer, but Premier is right up there, too... especially as it goes hand-in-hand with After Effects, which is great for SFX (if you can do all the calculations)!
I use Squadron White Putty myself... I found it to be a big improvement over Milliput and there's no messing about with mixing, etc. before application.
Some cracking shots there, especially the colour pics of Kilfree Junction and the Guinness railway... nice to see photos of how the narrow gauge Spence steam locos were able to run on the 5ft 3in sections!
It's a crying shame that the Guinness Hudswell Clarke diesel shunter wasn't preserved.