By training centres do you mean monasteries specifically designated as shugyou dera/doujou (修行 寺/道場) by one of the official Zen churches? Because of those, all Rinzai sects combined have only 33 in Japan, of which 20 belong to the Myoushinji tradition.
Here is a training temple of the Sanbo Kyodan group: Tetsugyuji International Zen Center
However, if you extend this definition to all Zen centres (not necessarily Japanese) where one can regularly practice meditation and participate in retreat, there are quite a few in the West of those. Or if you mean monasteries where monks live, there are some of them too.
"While teachers of the middle way, mind only, transcendent wisdom, mantra, and other schools may have their own assertions, the fulfillment of those intentions is the same. There is not a single thing that is not contained within mind."
(Gampopa to Düsum Khyenpa, in "The First Karmapa", KTD Pub, p254)
“If you recognize the world of appearance and existence as the mind, realize the mind itself as empty, and have no grasping at the superiority of your realizations — this is the ultimate view."
(Chegom Dzongpa, in "The Book of Kadam", Wisdom Pub, p609)