pendulum car
... that the pendulum car was an experimental forerunner of the tilting train, but was not widely adopted on American railroads?
... that the <b id="mwA2Y"><a href="./Pendulum_car" id="mwA2c" rel="mw:WikiLink" title="Pendulum car">pendulum car</a></b> was an experimental forerunner of the <a href="./Tilting_train" id="mwA2g" rel="mw:WikiLink" title="Tilting train">tilting train</a>, but was not widely adopted on American railroads?