I loved that book! NI railways were fairly sterile in the 80s - although compared with nowadays it was a paradise of interest! CIE by contrast was an amazing happy hunting ground full of relatively ancient stock - with Inchicore yard full of even older relics such as the G class and Sulzers. The departure of trains such as the Sligo Mail from Connolly had a real sense of occasion about it. Add in the freight flow, the ancient signalling that persisted in many places, a crop of derelict rusty branches that still trailed enticingly off the main lines, and you had a railway that held your interest !