The Chelsea-Hackney (or "Chelney") line is a safeguarded route for an underground railway running from south-west London to north-east London. As of 2008, the plan is being developed by Cross London Rail Links Ltd. who are the developers of Crossrail. It is therefore sometimes known as Crossrail 2.
- "Chelsea-Hackney Line". Crossrail. 2007-09-04. Retrieved 2007-10-18.