u/Specialist-Star2396

I'm struggling with keeping high capacity facilities (oil ref and steel mill) running at a decent efficiency. What's the consensus on the best transport for workers to these locations?

I am playing with pollution on so I need a bit of distance, but currently I'm using buses and struggling to keep the steel mill above 150 workers and the oil ref above ~60. I'm going to up my workforce because that is the main problem, but I'm wondering about transporting them. Am I better off switching to trams or trains? Or maxing out capacity on my bus lines and then adding more buses?