you will recieve the first clue to the meaning of life. after this, you may recieve more clues by uploading locomotives, coaches, wagons, routes, tutorials, and skins.
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air brakes? vacuum brakes? im not sure. it happens on the 43, and older DMUs (156 etc).
im not sure if it happens on the Kiha (never use that loco anyway). it dosent happen on any of the trains from the Brighton pack that i know of (newer trains?)
some trains brakes stop working when they are even nudged back toward the "released" position. if, say an HSTs brakes are at 50% Self Lap, then moved back to 48%, the brakes will lose pressure and release. it caught me out a number of times when i first found this. or of course you might be talking ...
for my the download server has been dodgy. im a premium member, and half the files wont download. it just sits there on xx%, or wont even start the download window.