Obtained from Transport for London, this search provides:
Information about existing TfL railway services (London Underground, London Overground and Trams), and information on proposed services that have been confirmed and approved.
TfL also provide a relevant Ordnance Survey 1:1250 scale location plan as appropriate
They may provide information on legal matters such as property rights, wayleaves, grants, consents, leases, licences or other arrangements which affect the property
Information about tunnel depths, and a location plan, as appropriate
Where a property is affected by Crossrail proposals, TfL will also forward your enquiry to the Crossrail safeguarding teams