And from Wiki:
> The network has relatively low ridership on a world scale [9] and compared to the city's bus network.[11] 55 million passenger trips were taken across the network in 2018–19.[12] In 2020, the pandemic drastically affected passenger numbers with many services, including peak ones, running at 90 per cent empty.[13]

Hence, a deeper look is that Brisbane's Rail has very little ridership and most of the 55M riders are with buses on roads.