Most of the older ones around the country are water only and have no means of removing waste water or sewage. These are left over from the days when there were no retention tanks and you only needed to top up the water. Off the top of my head the only places I can think of that have full waste water / sewage removal would be Limerick shed, Cork Shed, Portlaoise depot, Heuston, Connolly platform 1 and Drogheda depot. Am I missing any?