You trust the recipient to use the software correctly so that it protects the plain text from anyone who might later take his device off him.

While you don't save any time on your boarding and disembarking (assuming the moving platforms accelerate no faster than the full-size train would have and share a similarl track layout etc etc.), you do, fairly obviously, save time in total because the long distance train makes no intermediate stops.

Source for this claim? You're assigning a rabbinic Judaism to Jesus that post-dates him by several centuries. At his time congregation had to gather in the temple to have the Torah read to them, even in the Soferim (probably 8th century) there's suggestion that some villages contained only a single literate individual.

http://news.bbc.co.uk/local/wiltshire/hi/front_page/newsid_8750000/8750983.stm