There are several synonyms that can be used for the phrase "took bus-subway-train." Some possible options include "utilized public transportation," "used mass transit," "relied on transit services," "commuted via bus, subway, or train," "travelled by public conveyance," or "took advantage of urban transit options." Each of these phrases conveys the same basic meaning as "took bus-subway-train," but offers slightly different nuances depending on the context and intended audience. Choosing the right synonym can help to add clarity and precision to your writing or conversation.