Actually, it's no more expensive - in a lot of cases even cheaper - than other scales. The train in those videos was built from brass etchings, placed on RTR chassis.
They'll stabilise soon... Ryanair are in discussions with them about ordering 200 new aircraft: http://www.independent.ie/business/irish/ryanair-in-talks-with-boeing-for-200-new-planes-3347205.html
We don't have a 'Rest of the World' section so I'll pop this in here... a stunning Australian 'T' gauge (1:500) layout:
[video=youtube_share;9lTB0Swwbbw]
[video=youtube_share;dblVga1LBrk]
Blog here: http://victorian-tgauge.blogspot.co.uk/
Express Models sell a range of lighting kits that seem to be straightforward to install: http://www.expressmodels.co.uk/acatalog/4mm_Coach_Lighting.html
Just looked into this and it's written in the writer's personal drafting area, as opposed to being published and searchable on the main Wikipedia site. He probably just wrote it for his own amusement and didn't intend for it to be discovered like this.
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Don't know if it's of use to you, but the Spring 1994 edition of Irish Lines had drawings of the SS class. Available to download here: http://newirishlines.org/archive-2/