The construction of Quetta Mass Transit was included in CPEC during the 6th JCC held in 2016. Later, based on the pre-feasibility study that noted project is financially unviable, the provincial government decided to put the project on hold.
Source
http://cpec.gov.pk/project-details/45 https://tribune.com.pk/story/2089062/balochistan-govt-puts-quetta-mass-transit-project-hold