You're forgetting another important impact of above ground vs below ground metros.
The property/core real estate that you loose. Plus a lot of metros still have a noise impact as they run 24/7. I'm in Copenhagen by Ørestad and there's both the airport nearby and the metro. However the building basically fully isolates for the planes but the metros can still be heard.
Where the metro line is build there could be 10.000s of apartment units and other Comercial buildings, as as you mentioned considerably less maintenance. The above ground areas are also the ones most prone to failures and have often cancelations where you need to take a bus to the below ground part of the network.
Glad you mentioned Hong Kong--the city's largest housing estate, LOHAS Park, consists of 50 towers over a Tseung Kwan O Line station/depot.
Is it possible to tunnel in a coastal area with a very shallow water table? San Diego's automated light metro concept connecting Downtown and the airport might extend to Midway Rising, a nearby mega-TOD. Problem is, the water table in 2050 is projected to be 0-1 m due to sea level rise.
Plus: Downtown condo residents oppose the light metro because the viaducts will block their views; the city councillor for Downtown (who also chairs the transit agency) has even echoed their NIMBYism. Any tips for fighting the NIMBYs?
Excellent article. My question is on one specific point of detail more relevant to main line railways than city metros. Are hydrogen powered trains safe in tunnels, particularly if there is a derailment? This is a question I have often posed in writing at Webinars on alternative fuels. But it has always been ignored!
You're forgetting another important impact of above ground vs below ground metros.
The property/core real estate that you loose. Plus a lot of metros still have a noise impact as they run 24/7. I'm in Copenhagen by Ørestad and there's both the airport nearby and the metro. However the building basically fully isolates for the planes but the metros can still be heard.
Where the metro line is build there could be 10.000s of apartment units and other Comercial buildings, as as you mentioned considerably less maintenance. The above ground areas are also the ones most prone to failures and have often cancelations where you need to take a bus to the below ground part of the network.
How come it seems like most of the elevated train problems regarding alignments also exist with cut-and cover, such as being stuck to the street grid?
Glad you mentioned Hong Kong--the city's largest housing estate, LOHAS Park, consists of 50 towers over a Tseung Kwan O Line station/depot.
Is it possible to tunnel in a coastal area with a very shallow water table? San Diego's automated light metro concept connecting Downtown and the airport might extend to Midway Rising, a nearby mega-TOD. Problem is, the water table in 2050 is projected to be 0-1 m due to sea level rise.
Plus: Downtown condo residents oppose the light metro because the viaducts will block their views; the city councillor for Downtown (who also chairs the transit agency) has even echoed their NIMBYism. Any tips for fighting the NIMBYs?
Excellent article. My question is on one specific point of detail more relevant to main line railways than city metros. Are hydrogen powered trains safe in tunnels, particularly if there is a derailment? This is a question I have often posed in writing at Webinars on alternative fuels. But it has always been ignored!