Hotwater didn't explain anything. If you understand car braking equipment at all you know that that an increase in brake pipe pressure will cause brakes to release. The fact that these brakes don't operate like the newer brakes doesn't mean that they will stay set if the air is bottled. If a leak occurs and the brakepipe pressure increases enough, then the brakes are coming off. Also, if you understood the braking system on newer brake systems you would know that bottling the air will not always cause a brake release.
With the short length of these trains combined with the short time involved in running around the train and if the brake equipment in good working order, if the proper procedure is followed, the brakes should not release on their own if the air was bottled. That does not make it a safe practice!
All of this aside, with the short length of the trains, very little time would be saved by bottling the air.
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