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Forgive the video quality of my recording potato. This video demonstrates the turning clearance of the Blade loads on BLMA 89' flats. Inside radius of 11 inches.
Three outside smooth side passenger cars are on 12,3/8" unitrack with good clearance. Inside cars set approximately 9.5 radius. Clearance should be ok with 1.5/1.75" track spacing. But I wouldn't recommend anything under 18" radius.
In the original video, that's 15" radius ess curves coming out of the tunnel under the bridge (huh, that scene happens to be the thumbnail image!).