A Linear Guideway Block (often just called a “runner block” or “carriage”) is the high-performance, heavy-duty cousin of the standard bearing block.

While “linear bearing” is a broad term that can include cheap hobbyist parts, a Guideway Block specifically refers to a precision-engineered carriage designed to ride on a profiled rail (a square or rectangular rail with precision-ground grooves). These are the gold standard for industrial machinery.