a works depot just past the Sandyford terminus and opposite the old Stillorgan Railway station building. The depot could stable 32 trams. When the Green line was extended to Broombridge a further depot was constructed over part of the old Liffey Junction site. It was named Hamilton Depot in honour of William Rowan Hamilton who developed the quaternion mathematical number system. The primary control facility for the Luas system for such functions as power and signally lies at the Red line Luas depot at Red Cow. Following a storm damage incident in October 2017 at Red Cow it was found the depots at Broombridge and Sandyford were not able to take over the function and the whole Luas system was suspended for two days. Planned developments Green Line upgrade to metro A portion of the Luas Green Line between Charlemont and Sandyford was built with the eventual intention that it be upgraded to carry metro services. In the development of rail based public transport in Greater Dublin, it was envisaged that Metro North would be completed and operating by 2012. It was further planned under the Platform for Change that Metro South, due to operate from St. Stephen's Green to Sandyford would follow this by, according to the Platform for Change, 2020. However, due to the Great Recession, Metro North was delayed until 2015 at which point it was revived as the "new Metro North". At this stage, efforts were undertaken by the National Transport Authority to improve upon the original Metro North design and alignment. Originally, Metro North's 2012 alignment would connect to Iarnród Éireann's Western Commuter line at Drumcondra. However, new consideration was given by the NTA in the intervening period between 2015 and 2018 to divert the metro line from Drumcondra to Cross Guns Bridge, a point where the Western and South Western Commuter lines meet. Diverting to this area and building a brand new station called Glasnevin would enable the Metro to interchange with two rail lines both of which, would be high frequency DART lines at the time of the metro's opening. As the scale of the new metro North project grew, the decision was made to upgrade the Green Line from Charlemont to Sandyford to metro standard and connect it to Metro North all at once. This decision was made due to the Green Line's overcapacity issues. It was forecast that without an increase