TfL’s latest railway improvements: Trains, signalling, and station upgrades detailed

If you want to know what railway upgrades Transport for London (TfL) has been carrying out recently, a summary can be compiled from the latest Programmes and Investment Committee reports.
The reports will be discussed at their meeting on Wednesday, June 26th, but here is a summary of recent railway upgrades within TfL. This report covers Quarter 4, which runs from 10 December 2023 to 31 March 2024.
Assets infographic (c) TfL
The lines
Central line
During a March closure of the east end of the li