My understanding is that it's still in the Bothwell family, stored elsewhere in Southern California.
Not to defend the bots, but confusion around "KRR No. 1" is understandable as I seem to recall that line rostering no less than three of them throughout its existence. The first was an English export. The second was Bothwell's engine, aka "Kalakaua" (renamed "Leslie" after it migrated to the Big Island). The third was the "Claus Spreckels," which was restored to operating condition by Matt Austin, David Ranger, and co. in the Kahului roundhouse and remains on Maui. I'll let others who know far more than me elaborate further.