Ajit Pai @AjitPai
Every so often along the trail, you see 19th-century locks and lock houses (lock-keepers’ residences). Back then, the lock had to be staffed at all times, in case a boat needed to come through. Technology was key: the transition from swing-gates to drop-gates saved a lot of time. https://t.co/DdCSUI5Md1 — PolitiTweet.org