Originally Posted by James Shields
So is the proposal for Metro and Luas to share tracks? My understanding of the term "Metro" is total segregation from other forms of transport. I think the number of road crossings on the Green line alignment would make it problematic for a Metro route. Having to intersperse Metro trains with Green line trams would strike me as unworkable, and would severely limit the speed and frequency of the Metro service.
There are some examples out there where it has been achieved like when the Rotterdam Metro was extended to The Hague and some of the sections in the suburbs of The Hague were shared between The Hague's trams and Rotterdam's metros, but that section only has a metro every 10 minutes, which is not really metro frequency. It is certainly far from desirable.
See departure boards here, where RET is a Rotterdam Metro and HTM is a tram from The Hague