I don't think for a second that TfL Staff Passes will be valid on
National Rail (NR) at all whatsoever, even when Oyster PAYG is
(eventually) introduced on NR - indeed, there are already NR routes
where one can use Oyster PAYG but cannot use a TfL Staff Pass - e.g.
Rainham to Barking, West Drayton to West Ealing [1].

(I am no expert at all on TfL Staff Passes so I'm unclear on whether
they are valid on NR routes where interavailable ticketing applies,
e.g. Stratford to Liverpool Street.)


That I don't know either, but the reverse scenario is covered in

http://www.atoc.org/rst/_download/ru...20SGActive.pdf

Staff Travel Cards (dated appropriately), All Stations National
Rail "Status" Passes and Regional Status Passes (as appropriate) are
valid
for free travel on London Underground/Docklands Light Railway as
specified below:
Metropolitan, Hammersmith & City and District & Circle Lines:
(i) Moorgate and Kings Cross;
(ii) Euston Square and Watford, Chesham or Amersham, but not
intermediately between Baker Street and Harrow-on-the-Hill;
(iii) Paddington and Notting Hill Gate - Circle Line, for through
journeys
between Paddington and East Acton or westwards but not
intermediately or at Notting Hill Gate;
(iv) Paddington (Suburban) and Hammersmith (H&C);
(v) Shoreditch and New Cross or New Cross Gate;
(vi) Tower Hill and Upminster (except Aldgate East);
(vii) Putney Bridge and Wimbledon;
(viii) Turnham Green and Richmond;
(ix) Earl’s Court and Kensington (Olympia).

Northern Line:
Moorgate to Mill Hill East or High Barnet via Archway, but not
intermediately
Kings Cross to Highgate, except Kentish Town

Central Line:
(i) Liverpool Street and Epping or Hainault, via Woodford or Newbury
Park.
(ii) Ealing Broadway or West Ruislip and White City and in the case of
through journeys between East Acton or westwards and Paddington
also between White City and Notting Hill Gate, but not intermediately
between White City and Notting Hill Gate or at Notting Hill Gate.

Bakerloo Line:
Paddington and Harrow & Wealdstone.

Jubilee Line:
Stratford to Canning Town

Piccadilly Line:
Finsbury Park and Kings Cross but not intermediately.
Victoria Line:
Finsbury Park, Highbury & Islington and Kings Cross.

Waterloo and City:
Waterloo and Bank.

Docklands Light Railway:
Tower Gateway and Limehouse.

Also, Residential Passes (made out with appropriate availability) are
valid
on the above lines with the exception of:
Hammersmith & City Line:
Valid only between Paddington (Suburban) and Westbourne Park and not
valid at
Royal Oak.

District Line
Valid between Tower Hill and Upminster but not intermediately between
Tower Hill
and Bow Road, except at Aldgate East when shown on the pass.

Northern Line
Not valid between Moorgate and Kings Cross or at Kentish Town

Central Line
Not valid at Bethnal Green or Mile End or between Ealing Broadway and
North
Acton

Most of these seem to be historical artefacts, and only match the
interoperability rules for fare-paying passengers in a few cases.