(IN-49-10) in Indianapolis, Marion County, IN. IN431 (Keystone Av.) S. 0.6 miles from jct with I465 exit 33 on the N. side of Indianapolis, E. on 86th St. 0.25 miles, N. on Keystone Xing 0.4 miles to the bldg on the E. side of the road. (N39 55.023 W86 06.517) Photo by Jerry Freeze 02-2004.