Station 7 and NCCo Station 20 were dispatched to the DMB Rt 295 West for a commercial vehicle fire. Fireboard advising incoming units of a transit bus being fully involved. 7-9 arrived to confirm same and placed a 2in line in service. Upon the arrival of 7-2 a second line was placed in service. All passengers were accounted for and being controlled by DRBA Police and eventually transported to the admin. bldg. NCCo FM18 was notified and responded to scene. All units cleared after control searches and communications with FM18 and bridge PD commander.