The present invention provides a Fe\u2014B\u2014Si system amorphous alloy thin strip excellent in high magnetic flux density, thermal stability, amorphous formability improved workability and low core loss. During the selected period, either the fluid pressure sensed automatically resolves or the method further comprises a step of setting a fall alarm condition. The truck further includes a turning mechanism between the axle housing and base, around the kingpin. The coupling members may comprise hook and loop members, a snap, a button, or interlocking members.