Abstract: A clocking system for measuring running speeds such as split time or lap time for a plural number of track runners like racehorses at each one of a plural number of clocking positions provided at predetermined intervals along a running course or track toward a goal position. The clocking system fundamentally includes: a trigger signal transmission means provided at each one of the clocking positions and adapted to release a trigger signal toward a narrow signal receiving zone; a passing signal generating means carried by each runner and adapted to produce a passing signal specific to a particular runner at each clocking position upon reception of the trigger signal; and a measuring means provided either at each clocking position or on each runner and adapted to register a time reading for each runner upon reception of the trigger signal or passing signal.