Schwebebahn in Wuppertal: centrifugal forces

 The Schwebebahn in Wuppertal is an amazing overhead monorail built about 100 years ago. It is nearly 10 miles long and really looks like Blade Runner from below. It's one of the wonders of Europe.

The carriages hang from a single suspension point.

This means that as you go round corners, the carriages lean outwards. It feels as though the carriages are being pushed outwards. My Physics teacher at school was quite clear: "There is no such thing as a centrifugal force." There are only centripetal forces pulling towards the middle. Here, the centripetal force is the contact force of the rail pushing on the wheel. The wheel goes round the corner. The carriage has inertial mass. Newton observed that inertial masses like to keep going in a straight line at constant speed. The wheel turns the corner but the carriage tries to keep going straight so it starts to lean out. No centrifugal force here, just inertia.