The reason why the government threw money at IE to buy all those ICRs was because of EU rules, you could no longer allow raw sewage to be flushed on to the tracks & a minimum requirement for wheelchair access in each coach, the cost of converting 'old' stock v buying new stock ( taking in to account these new trains would eliminate guards, shunters, TTCs, turnarounds etc) then as a business case it made sense. In reality though......!!!! By the way those ICRs are far from fuel efficient compared to Loco hauled trains, you have an engine & generator under each coach running at full pelt, up to a certain number of coaches they are but anything from say a 6 piece & up, they are not. We mightn't like it but unfortunately the accountants are running the railway so heritage, nostalgia goes out the window