Line 126 is a bus line that runs between Maassluis, Vlaardingen, and Schiedam. All of these cities are situated west of Rotterdam. During day hours on weekdays, buses run every two hours. On Saturday there is one bus per hour.

There is no Sunday service on line 126. On Sundays, passengers can use STOPandGO-line 526, or walk to the closest metro station if not too far away.

Passengers can change to the metro at Maassluis West, Vlaardingen Oost, Vijfsluizen, or Schiedam Centrum.