The ITPS timetable data published by Network Rail contains advertised passenger train schedules for all the Train Operating Companies.
Trains operated by third-parties wholly or partly over Network Rail tracks also appear in the ITPS data; principally for train operating purposes, but also for passenger retailing where National Rail fares are valid. Services meeting the latter condition include:
London Underground Bakerloo Line between Queens Park-Harrow & Wealdstone
London Underground District Line between Richmond-Gunnersbury
Tyne & Wear Metro between Sunderland-Newcastle Airport
Though the ITPS schedules include some stops beyond the boundaries of the Network Rail infrastructure those remote locations may not necessarily be displayed in public-facing journey planners.
Trains on one further route appear in the ITPS source data, but do not get into PMS or public-facing systems because they do not serve any National Rail stations:
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London Underground District Line between Wimbledon-East Putney
Passenger trains run by four further operators, that do call at National Rail stations, are deliberately excluded from DTD, PMS and public-facing journey planners. National Rail tickets are not valid on those trains, so their absence prevents them from being quoted incorrectly to the public:
Eurostar
North Yorks Moors Railway steam trains running between Pickering-Whitby via Grosmont
West Coast Railways steam trains running between Fort William-Mallaig
Sheffield Supertram between Sheffield and Rotherham Parkgate