What I have just said in the chapter on harness for single horses applies generally to harness for a pair.
Kay collars should be used for pairs with all traps, except that Dutch collars may be used for a pair with
runabouts or any other light country trap. There is a very light station trap, finished in natural wood, with which russet harness with Dutch collars, for a pair, looks very smart and may be used in the country.
Double Road Harness
Note the yoke
The horses may be coupled to the pole with either pole chains or pole pieces; the former with oval links are correct when the owner drives, but are never permissible in any trap driven by a servant. The chains should fasten at the pole and no extra links should be allowed to hang. The pole
chains, if used, should be of burnished steel and not of brass. Oddly enough, for some reason which has never been explained, pole chains and pole pieces are regarded as belonging to the trap and not to the harness.
English Phaeton Pair Harness
Note the loin straps, which are correct only when servant is driving
Loin straps should be used with a lady’s trap only when a servant drives.