Modeling topic

Question brake details of B&O M-53
I would like to ask you about a detail of a brake detail on a B&O M-53 which exist on other more modern freight cars also, I think.
Please open this link - https://www.pwrs.ca/new_announcement_images/products/Fox_Valley/Cars/Prototype.jpg
What is that for a part under the right end of lower door guide which is mounted under the car body.
I would be lucky to get your helpful information. Thanks!

Pre-Ops Ops
If you host regular operating sessions, one of the necessary evils is having to set up the operating session. And sometimes that can take as long (sometimes longer!) than the session itself. But just like cooking - where it often takes longer to prepare the meal than to eat it - if you enjoy the process of preparing a meal then that's just as much fun as the meal itself.
Anybody else feel this way? Ops set up: necessary evil, or added benefit?
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