The Wikipedia article I posted above states: "In the west, the principle teacher of the Shangpa Kagyu lineage was the first Kalu Rinpoche. He received the lineage teachings in the early 1940s when he went for training at Tsa Tsa Monastery in Eastern Tibet. He trained with the Abbot of the monastery, His Holiness the eighth Tsa Tsa Drubgen, Yizhin Norbu, also called Karma Singhe and the White Crown Master. The Karma Kagyu regent H.E. Tai Situ Rinpoche described Yizhin Norbu as “one of the most learned and accomplished Kagyu masters now living.”
There, Kalu Rinpoche received the complete cycle of the Shangpa teachings during a closed retreat. Tsa Tsa monastery is also a major Dakpo Kagyu Centre and preserves the rime tradition. His Holiness the Tsa Tsa Drubgen Yizhin Norbu died in the middle of June, 2005. The Shangpa traditions are currently held by his regent and successor His Holiness the second Gyalten Thongwa Rangdrol
Maybe of topic but according to Kyabje Kalu Rinpoches site the only masters upholding the Shangpa lineage are Yangsi Kalu Rinpoche, HE Tai Situ Rinpoche, HE Gyaltsab Rinpoche and Kyabje Tenga Rinpoche http://www.paldenshangpa.org/Official-Letter.html
So does anybody know anything about that Shangpa lineage in Tibet upheld by HH the 2nd Gyalten Thongwa Rangdrol?