You can use the scp (secure copy) command to transfer the files from one server to another. The basic syntax is as follows:

```ruby
scp -r user@server_a:~/Documents/training_results user@server_b:~/training_results
```
Here, -r option is used to copy the directory recursively, which means it will copy all the files and subdirectories within the ~/Documents/training_results directory.

You'll need to replace user with your actual username on each server and enter your password when prompted.
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