Without working savegame support this is not possible, because Red Alert stores units and buildings in the savegame file to remember them.
The 10EA and 10EB feature in Red Alert (with SkipMapSelect=yes) might be possible in RA2 already, but I don't know for sure. TS starts a special mission when you enter a train with the Ghoststalker in a late-game mission, too.
Without working savegame support this is not possible, because Red Alert stores units and buildings in the savegame file to remember them.
The 10EA and 10EB feature in Red Alert (with SkipMapSelect=yes) might be possible in RA2 already, but I don't know for sure. TS starts a special mission when you enter a train with the Ghoststalker in a late-game mission, too.