Having a look through previous sale threads, it appears that the maximum % discount available on any loco add on, route, gameplay pack, or core pack etc. has been 80% - other than a 90% discount applied to the TGV route and Flying Scotsman. Does this match what people tend to find, as if so, buying TSW6 Deluxe now for 40% off as I was initially planning may not be worth it, especially seeing as I only want to get the UK content this time, so it may be worth waiting for 80% of those down the line. Looks like the TSW4 stuff (released around September 2023) reached that point in February 2025.
Has PS 40% off for the Deluxe edition, on Xbox only 30% now. But yeah, better wait for a better sale, recently I bought TSW5 for only EUR 8,99. I'm also only interested in the Riviera line and the 220, so I will wait for a steeper sale.