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From: rbowman <bowman@montana.com>
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Subject: Re: Autoblock feature of shopping carts.
Date: 8 Dec 2025 08:14:03 GMT
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On Mon, 8 Dec 2025 01:58:46 -0500, Paul wrote:


> It takes a while to absorb what is going on there, and what component
> makes rail "safe". Hint: It's not the hardware. You have to read
> articles like this more than once,
> to fully appreciate it.

That does seem to be convoluted. The parking brakes on a truck are spring 
brakes that are applied when there is no pressure. The service brakes are 
normally released and require air pressure to apply. A mile of cars each 
with their own air supply and the signal supply complicate things. 

Then there are the mechanical handbrakes. I don't know when, if ever they 
get used. Maybe when they're humping cars?