As part of RailGen 2.0 implemented from 2014 onwards to improve the standards of the rail network, the signalling systems on the older lines are to be replaced with new CBTC systems; the system used for the pre-merger network will be replaced with Alstom-Thales SelTrac whereas that for the East Rail line will be replaced by Siemens Trainguard CBTC. However, the signalling upgrades encountered a serious setback in the form of a train collision outside Central station on 18 March 2019.