IMG_0136_bart Published October 24, 2011 at 800 × 600 in Caltrain+BART+Bike = Mt Diablo, 80 miles, 6400ft of climbing= great ride, but oh my has the Dumbarton bike path deteriorated! Riding BART from Millbrae to Walnut Creek. No place to stash your bike; you hold onto them for the duration. Riding BART from Millbrae to Walnut Creek. No place to stash your bike; you hold onto them for the duration.