On these pages I assume that one has a working installation of TTDPatch or OpenTTD at hand, I also assume that certain switches and settings are set and activated, because without them various features do not work. In order to get to that point, you can follow the short installation guide below.

Installation

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OpenTTD is also available on gaming distribution platforms like Steam or GOG, but that changes about nothing about the installation process.

The installation is described in all detail in the Wiki, so just follow these instructions.

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Configuration

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In these guides I assume that the default settings are used, so only settings that really have to be changed in order to follow these guides are given here. You should really take the time to read about the meaning of every setting and tweak the game to your likings.

OpenTTD/JGR's patch pack

Just about every setting in OpenTTD/JGR's patch pack can be accessed via menus in the game. Each setting also provides a tool tip when hovering above it with the mouse.

Some advanced options can be set by editing the necessary lines in the configuration file "openttd.cfg". This is a simple text file which can be opened and edited using the Windows text editor.

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Extensions

There is a countless number of "mods" for the game. These can be new vehicles, additional industries, changed graphics for signals, stations and houses and so on. These sets come in the form of grf-files (a TTDX-specific format).

OpenTTD/JGR's patch pack

OpenTTD/JGR's Patch Pack contain a download client to access content from the so-called BaNaNaS page. This page also acts as a database for available extensions.

Alternatively (e.g. the extension is not available on BaNaNas), extension sets can be added to the game by copying the grf-file into the data-directory inside the OpenTTD folder. Then you can manage the sets in a specific menu from within the game.

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Some extensions require features that are only available in JGR's patch pack and will not work correctly in OpenTTD. This is especially valid for sets with extended railway signal types.
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Even though it is possible to change around the sets used in the game during gameplay, you should never do that. It will fail almost always, because vehicle properties might get changed or industries suddenly accept other cargoes, or whatever else you would not have thought of.
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It might be tempting to just add as many additional graphics sets to the game as possible, but this should not be done: Most sets are not compatible with each other. In the best case, they just deactivate themselves, in the worst case they influence each other, so that for example the costs for vehicles shoot through the roof and normal gameplay becomes impossible!