Yes, PLUSBUS day tickets can be purchased at the same time as train tickets online from most rail ticket retailing websites.
How will I get my tickets?
When you buy train and PLUSBUS tickets online, you will be asked to choose how you want to obtain your tickets. The options are:-
Collect from a self-service ticket machine at the station (for free). If you choose this option and want bus travel to start your journey, then you will have to collect your tickets on a previous occassion.
By post - please allow up to 5 working days for delivery.
Courier - next day delivery is usually available (for a small additional charge);
Collect at the station ticket office.
To start your journey with a bus or tram trip to the station, you must choose to obtain your tickets in advance of the day of travel (by post, courier, or pick-up from a station on a previous occasion).
You must show the actual PLUSBUS ticket to the bus driver (or tram conductor) to travel. We're sorry, an online booking confirmation will not be accepted for travel.