But this testing is different to the testing you are referring to. When new trains are tested, majority of it centres around the actual trains and whether it can cope in the environments it is planned to - not much in most cases is about infrastructure for the most of it unless you factor in stuff like signal interference. All Crossrail testing is related to testing the brand new trains, signals, tracks and stations - every brick laid, every bolt drilled and every cable mounted is going to be rigorously tested to check it is safe and can operate. Unfortunately that brings no benefits to TfL or Crossrail opening up the same station just downstairs. It would increase operating costs in the short term if anything and would not change revenue as it is the same passengers and connections offered. It is also not in TfL's interests quite bluntly if Greater Anglia cannot improve their services as a result of delays to Crossrail. TfL, like most other companies, only care about their own balance sheet and objectives and will not lose sleep about disrupting others'.