Uncomment data download/untar commands; update writing to match

[OliviaLynn]

Problem & Solution Description (including issue #)

112

Code Quality

• [x] My code follows the code style of this project
• [x] My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (a47c55d) 100.00% compared to head (315e9f3) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #113 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 1 1 Lines 1 1 ========================================= Hits 1 1 ```

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[sschmidt23]

Actually, given that it's hours before Thanksgiving holiday starting and people likely not being around if a new rail_base release would break something, I'll hold off on the new rail_base release.