How do I get all of the routes that came with the rush hour season ticket even though the bundle isn't for sale anymore? I am wanting to get all of the routes in the same purchase.
You will have to purchase them separately unfortunately as the season ticket was only for a limited period (it did last several months however).
You should still be able to buy the Deluxe Edition which comes with all three at a saving over buying them individually. Not sure about Xbox, but in the PS Store November sale, it was discounted to season pass price; definitely worth waiting for a sale. https://www.xbox.com/en-GB/games/store/train-sim-world-2-rush-hour-deluxe-edition/9PF05DWXB2QG/0010
Buy the deluxe edition. While you can't get the season pass any more you still make 24.99 saving than buying them separately