In message , at 00:12:24 on Sat, 30 May
2015, Mizter T remarked:

Not sure when MTR Crossrail's concession lasts until.

It's eight years, starting tomorrow with the Shenfield (aka TfL Rail)
services. The first ones to be branded Crossrail will be running from
May 2018 and the full route won't start until "late 2019", so that's
four years of introductory work and just four years with the finished
product.
--
Roland Perry