‘metro’ (also known as ‘subway’, ‘metropolitan railway’ or ‘underground’) means an electric railway for the transport of passengers with the capacity for a heavy volume of traffic and characterised by exclusive rights-of-way, multi-car trains, high speed and rapid acceleration, sophisticated signalling as well as the absence of level crossings to allow a high frequency of trains and high platform load.
ciallaíonn “meitreo” (ar a dtugtar freisin “traein faoi thalamh”, “mearchóras iarnróid cathrach” nó “iarnród faoi thalamh”) iarnród leictreach le haghaidh paisinéirí a iompar a bhfuil acmhainn ann do mhéid mór tráchta agus arb iad a chomharthaí sóirt cearta eisiacha slí, traenacha ilcharranna, ardluas agus luasghéarú mear, comharthú sofaisticiúil agus easpa crosairí comhréidhe ar mhaithe le hardmhinicíocht traenacha agus ardlód ardán.