Synopsis

A new mine had been opened, accessible by both standard and narrow gauge railways. An old boulder, displaced by the construction, had been positioned to secure the site. Rusty, a little apprehensive about the arrangement, watched as it settled into place. Time passed, and then, with a sudden tremor, the boulder broke free from its moorings, plummeting down the cliff face. It hurtled along the tracks, gaining speed, and began to chase Rusty. He narrowly avoided the rolling mass by scrambling onto