Issue for me is I have had a knee replaced and am not supposed to carry heavy objects, especially not up and down stairs.
Last time we were in Oxford, it was a day trip with no baggage. But this time it is part of a longer trip and I will have a 140 cm (L+W+H) roller bag with me. Are there lifts to and from the platforms? As I recall, in one direction you were on the tracks farther from the station and had to change levels to get to the station.
Thank you for your help!