Add: OpenTTD 15.0-beta3 announcement (#357)

Author: 2TallTyler

_posts/2025-08-31-openttd-15-0-beta3.md

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+---
+title: OpenTTD 15.0-beta3
+author: 2TallTyler
+---
+
+Did you have a lazy summer? Over at OpenTTD HQ, we did not!
+
+We've continued to make improvements to OpenTTD, both very visible to player and under the hood. It's time for another beta so you can help us test. Highlights include:
+* Bridges can now be built over stations (NewGRF stations must be updated to support this)
+* [NewGRF] Bridge GRFs can now have pillar information, so that a pillar can be skipped if it obstructs the tile below (rail, road, or station)
+* Ships traveling in opposite directions try not to drive on the same line of tiles
+* Purchase and picker menus can now be filtered using NewGRF Badges
+* Settings and Options menus have been merged
+* Scenario Editor has improvements for placing and expanding towns
+  * New buttons to expand town roads and buildings separately
+  * "Many random towns" button now prompts for the number of towns
+* Picker window sprite previews can be increased in height, so you can see the entire skyscraper in the house picker (for example)
+* The Infrastructure list window now has a scrollbar
+* A variety of bugfixes
+
+(As always, see the changelog for further details).
+
+* [Download](https://www.openttd.org/downloads/openttd-releases/testing.html)
+* [Changelog](https://cdn.openttd.org/openttd-releases/15.0-beta3/changelog.md)
+* [Bug tracker](https://github.com/OpenTTD/OpenTTD/issues)