Input (grade 8): During the early 2000s the plan was developed by Cross London Rail Links Ltd., the developers of Crossrail, and the line is therefore sometimes known as Crossrail 2 and expected to be a large gauge tunnel.
Output (grade 5): 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.