Rain Forest and Touch The Sun emerged from a long session at Capital Centre yesterday with prestigeous trophies to show for their efforts as the junior hunters began their three-day track-toward Washington International Horse Show championships.

Rain Forest, a6-year-old brown gelding owned by the Ri-Arm Farm of Franklin Lakes, N.J., won the Tiny Memorial Challenge Trophy for small (under 16 hands) junior working hunters. Peter Leone switched from compelling in the international-open classes to handle the winner.

Adriana Galesi turned in a beautiful round aboard Equinox Farm's Touch The Sun to win the Lester Moore Memorial Perpetual Trophy, and under-saddle class also for the small junior working hunters.

Bonwie Blake of Wayland, Mass., drew the most attention in the afternoon when she showed Gozzi and won a large (16 hands and over) junior working hunter class. Her mount, an aged brown gelding, was no stranger to the Capital Centre ring, having won the 1973 regular working hunter tricolor. Gozzi is one of the ranking working hunters of the past five years.

Lynne Siegel's Kensington was the star of the Thursday night program without winning any of the championships. Ridden by Lu Thomas, Kensington won the final stake class, the Shenandoah Challenge Trophy, to gain the reserve tricolor behind defending champion Stocking Stuffer among the regular conformation hunters. In the afternoon the 6-year-old bay beauty had been reserve to the sensational Early Light in the green conformation division.

Ruxton, the 7-year-old bay gelding shown throughout the week by Charlie Weaver, ended its competition like a true champion by winning its final stake class to gain the regular working hunter championship with 17 points. It was the first time since the Not Always Challenge Trophy had been offered for the winner of the division that a hunter had managed back-to-back victories.

Gucci, owned by Polly Haebler Van Dyke and ridden by Bernie Traurig, won its final stake class to gain the Intermediate Jumper tricolor with 15 points. Melanie Smith rode the Stillmeadow Farm's Calypso to the reserve with 13 points.