To be fair to all:
1. CIE. As said elsewhere, their remit is to get people from A to B; their holding of the post of heritage officer, for example, has more to do with the practicalities of how to compromise listed building status with the need to alter a heritage building for modern use. They are not a museum, and consequently have no related responsibilities. In addition, they have always been approachable by reputable heritage groups for acquisition of "threatened" historic vehicles. By their offices, A39, 141, 142, 800 and 90 were preserved, along with the SLNCR railcar and at least two MGWR 6 wheelers, which are variously in the care of ITG, RPSI, DCDR & UFTM. Add to that the numerous other diesels they hav e made available to the ITG, and carriages for the RPSI.
2. Preservation Groups. The UFTM, RPSI and DCDR have all had discussions at some stage in the past with Inchicore with regard to 6111. Thus far, nothing has arisen from these discussions - but never say never, I suppose. Each of the above (with UFTM's exception) is a voluntary group with limited space, money and manpower, and with the best will in the world cannot acquire something simply because it's important - as 6111 doubtless is. There has to be somewhere to put it, several thousand euros to transport it, and so on, even without a long term plan to fix it up.
In terms of setting up a transport museum, it isn't CIE's responsibility. In addition, they are constrained by railway disposal laws in terms of how, when and to whom they can offer disused routes; apparently they can only offer to a local authority, who will then have a choice of spending ratepayer's money on acquiring land to be given for nothing to a heritage group, or sold to them for market price. Few heritage groups will have this, and access to grant aid is limited for a "start-up" group, as they will be applying for money to develop something they don't yet own. (This has been a stumblin block to a number of heritage set-ups over the years).
So who, and where, can we lay blame at for the lack of a museum in the 26 counties? The Government. If there is to be a NATIONAL transport museum, one would expect it to be like York. Who funds that? The British Government, not Network Rail or any voluntary preservation society. Until and unless those in charge of the country (God help us!!) take such an initiative, nothing will be done. And by now it's purely academic - there's nothing left to put in it bar 6111. No MGWR locos, no West Cork locos, no this, no that....
A forward looking administration in 1960 would have had the pick of what was still there. The most luxurious passenger carriage ever to run on this island - the MGWR 12 wheel saloon... numerous narrow gauge things... and so on.