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Comparison tables are substantially outdated, at least about work-in-progress. This is only really of value as a historical document now.

Here you have a small comparative between OpenTTD and TTDPatch Features

If you are a regular TTDPatch user, you will notice that many similar things are implemented differently in OpenTTD. Not all features are compatible with TTDPatch.

• Quick savegame conversion guide

Features shared by TTDPatch and OpenTTD

These features work exactly the same as in TTDPatch. Some of them need to be manually activated, see Advanced Settings.

Note
List is currently incomplete!

• Water Transport Tiles / Water Transport Tiles / rivers
• Change station spread
• Longer stations / more platforms
• Ability to join stations (of same width or length)
• Mammoth trains
• Multiheaded trains
• build on slopes / coasts
• Go to depot orders
• Longer bridges
• Higher bridges
• Presignals
• Signals
• Advanced Non-stop orders
• Orders
• Orders
• Crossing tunnels cheat
• Plant many trees on a tile
• Bribe the town authority
• No train servicing
• No inflation
• Full load any cargo
• Select goods option
• New starting date
• Change default servicing interval for vehicles
• Change max # of vehicles per player
• More currencies (including Euro introduction in 2002)
• Colorful newspaper after a certain date
• Electrified Rails (Extra type, compared to replacing types in TTDPatch. But 8 independent track types is WIP in TTDPatch.)
• Dual Company Colours
• New Sounds
• NewGRF Houses
• NewGRF Industries
• Ability to sort vehicles list by different properties
• Sell entire train
• Enhanced bridge construction
• Gradual loading / unloading
• New cargo types
• Drive-through Road Stops (by mart3p)
• Tramways
• Landscaping (Change slope on non-empty tiles)
• Signal type selection GUI
• Path Based Signals (PBS)
• Signals that are only stopping locations from one side
• More airports per city

Features that are significantly different in OpenTTD

Note
List is currently incomplete

• Waypoints.
• New AI.
• Two new Bridges instead of raise Bridges speed limit.
• Drag and drop for most tools.
• Convert rail (from and to rail, monorail, maglev).
• Sell entire train.
• New buttons in GUI instead of shortcuts.
• Drag and Drop signals (Auto-Signals).
• Configure most Advanced Settings inside the game.
• Landscaping toolbar.
• Servicing intervals in percentage of max. reliability.
• More detailed performance ratings.
• Extra Viewport.
• Ability to Move company HQ.
• Magic bulldozer cheat to remove industries etc.
• Replace vehicles in OpenTTD uses manual selection. This differs from TTDPatch which uses automatic selection based on criteria supplied via newgrf.
• Clone Vehicle is available for all vehicle types in OpenTTD, but only trains in TTDPatch.
• Station tile/platform removal
• Direct construction of non-connected stations (also called Distant-join stations)

TTDPatch features currently not in OpenTTD

Note
List is currently incomplete!

• Low memory version
• Abandoned Roads
• Signals that will only let selected trains/train types through (Restrictive signalling)
• Signals that change red/green state depending on various map state (Programmable signalling)
• Non-straight and junction bridge heads (Custom Bridgeheads)
• Selection of which disasters may or may not happen
• Automatic creation of presignal setups
• Configurable steam plumes for steam engines
• Independent acceleration model settings for all motive power (unnecessary)
• ~25 different town growth controls

Features only available in OpenTTD

Note
List is currently incomplete! See [here] for a complete list

• Larger maps (up to 2048x2048 or even more with patches)
• Vehicle introduction dates later than 2050
• co-existence of different vehicle sets and 65000 different vehicles per type (engine pool)
• max 255 Network clients
• max 15 companies
• max 15 network administration connections
• max 16 different newgrf-definable railtypes
• convenient in-game download of online content (newgrf, AI, heightmaps, scenarios)
• newgrf airport tiles and rotatable airports (via newgrfs)
• translatable newgrf descriptions and newgrf versioning
• Fast forward
• Passenger and Cargo Distribution (Cargodist) - passengers and cargo have destinations
• Automatic vehicle separation from timetables
• Infrastructure maintenance

See also

• Roadmap — The Roadmaps
• Requested features — List of WIP Suggestions
• NewGRF TODO — A list of NewGRF WIP features for developers.
• Comparison of OpenTTD and TTDPatch features — Full List of features
• Mini Integrated Nightly — The list of patch of the precedent nightly

Comparison Chart (Not exhaustive)