CN Rail's preliminary investigation points to the failure of a wheel-axle combination in a car as the trigger for a derailment that led to a huge fire near Plaster Rock on Tuesday.

Unlike a solid axle, where when one wheel goes up, the other goes down, a split axle's wheels articulate independently of either side. The earliest popular format of this design dates to the 1960s ...

In a traditional car, the front wheels turn left or right and the car steers in that direction. With four-wheel steer, all four wheels are capable of turning. This effect can be achieved in a ...