Carbon reduction should be as central to the decision-making process on projects as safety considerations are, Transport for London (TfL) said.
All TfL projects worth more than £50M have to produce a whole life carbon model, and carbon reduction has been “part of the decision-making process” while planning the Camden Town and Holborn station capacity upgrades.
TfL principal project engineer Rand Watkins said at New Civil Engineer’s Tunnelling Summit 2017: “Carbon [should be] used to make design decisions in the same way safety is”, later adding, “safety is business as usual, carbon needs to be business as usual”.
A number of carbon reduction techniques will be used in the Holborn station capacity upgrade, which will involve creating a new entrance, escalators and lifts to improve step-free access. A disused platform will be brought back into use instead of creating a new tunnel. Works on the upgrade are scheduled to begin in the early 2020s.
In plans for the Camden Town station upgrade, which is scheduled to start in 2020, the number of levels was reduced from six to one in order to reduce carbon. The station will be enlarged to meet increased passenger demand. Work will include construction of a second entrance and exit with a new entrance hall and access tunnels and the extra space will allow for future capacity expansion of the Northern Line.