I'm now wondering why they're still keen on the higher track access charge.
The thing with open access, is that all operators need to pay the same equivalent charge if I came to tfl and asked for open access rights to the crossrail core, I would be entitled to providing I paid the same as MTR crossrail paid. .The way operators generally get round this is they limit by making the specifications for open access so tight that they cannot be done by any other operators. For example someone posted the open access agreement for the crossrail core a few months ago. It was something like this:
Doors to be compatible with platform edge doors, that goes the full 9 car length of the platform
Passenger service only with a total pax capacity of 1500 to prevent overcrowding
Electric overhead traction to ensure the tunnel isn't polluted.
Compatibility with crossrail signalling system
Operator responsible for own ticketing on the service.
Stopping at all stops in normal service due to the high frequency of the line
This effectively made it impossible for anyone else apart from MTR crossrail to run a service on the crossrail core,
The only exception to this is london underground, the original example I was going to use for this is the east London line, but then remembered London underground is excluded from open access legislation