1) Baton races 2) Certain races 3) Circuit breakers 4) Communications satellites 5) Electrical devices 6) Fresh crews 7) Imparts 8) Makes a pass 9) Multiple-person races 10) Passes along 11) Passes on 12) Pony Express riders 13) Pony express segments 14) Race 15) Races or electrical devices 16) Races with batons 1) Passes on 2) Sends 
Relay races are events for teams of four, in which an athlete runs a given distance, passing a baton to his or her successor.
[n] - a race between teams
relay race noun a race between teams; each member runs or swims part of the distance
A swimming event in which 4 swimmers participate as a relay team each swimmer swimming an equal