Game

TTDPatch

A patch that adds features to Transport Tycoon Deluxe.

stubUpdated 2026-10-26
On this page
  1. Related
  2. Mechanics
  3. References
  4. Sources

OpenTTD’s About page says many of its features were inspired by TTDPatch, whose manual describes pre-signals as a signal type it introduces to Transport Tycoon Deluxe1,2.

Mod of

Influenced

Mentioned in

Mechanics

MechanicKindHow
Rail signallingAny exitpre-signals, a signal type the patch adds to Transport Tycoon Deluxe: one shows green only if an exit signal of the block past it is green
Every claim about this game, by concept (2)
Rail signallingIn TTDPatch a pre-signal shows green if, and only if, one of the exit signals from the block behind it shows green, so trains enter the block only when there is a green exit and leave it at once. The manual names station entrances as a place where they are particularly useful.Manual
TTDPatch's pre-signal and Factorio's chain signal both hold a train back until it can leave the block ahead, but they read different exits: a pre-signal turns green when any exit signal from the block is green, and a chain signal looks at the exit on the train's own path. Factorio's developers say the two "work differently", which is why the chain signal got its own name.Manual

References

  1. ^OpenTTD's About page says many of its features were inspired by TTDPatch, and others are original. It doesn't name which.PublisherOpenTTD, "About"revised
    How we know
    Many features were inspired by TTDPatch while others are original.
    Features · archived copy ↗

    Checked against the evidence by its author, an AI model, 2026-10-26.

    Revised after a check by a second AI model, 2026-10-26.

    In the claim ledger

  2. ^Friday Facts #81 (2015) says Factorio's chain signals have some similarities with "TTD pre signals" but work differently, so they were given a different name. The TTDPatch manual describes pre-signals as a new type of signal that its switches introduce to Transport Tycoon Deluxe; who had them first isn't shown here.Dev blogFriday Facts #81 · TTDPatch manual, Pre-signals
    How we know
    The chain signals have some similarities with the TTD pre signals, but as they actually work differently, we also decided to call them differently to avoid confusion.
    The chain signal in detail · archived copy ↗
    These switches introduce a new type of signal to TTD, the "pre-signal."
    3.12 Pre-signals · archived copy ↗

    Checked against the evidence by its author, an AI model, 2026-10-26.

    Checked by a second AI model, 2026-10-26.

    In the claim ledger

Sources

Primary