Trainz Railwayz is an OFFICIAL bundled version of Classics distributed by the US Trainz distributor Merscom.
This has been announced for some time and Railwayz includes Classics AND TRS2006.
It is (To the stretch of my knowledge) approved by Auran, but just includes two versions of the game.
Since you get both versions, it is then possible to make a full "Legacy" version of Classics, though it is not approved, let alone encouraged, to do this by Auran and any layouts uploaded to the DLS using excluded content will be apparently be rejected by Auran.
NOTE: Railwayz still has Classics booting as "Classics" and TRS2006 booting as "TRS2006". They are supposed to be on two separate disks as two separate complete games, will install separately and will run separately.