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A blue electric locomotive passing a green passenger coach on parallel tracks in Transport Fever 3, with a third track curving away under overhead wires
Screenshot: Transport Fever 3 © Urban Games

Guide

Train Signals and Deadlocks in Transport Fever 3

Trains that wait forever are often a signal problem: one is missing, or it stands in the wrong place. Pick what you see to find the cause and the fix, then check the layout in our drawings.

Last updated Game version: Release version, manual pages revised 2026-09-29

The short answer

  • Signals make sections. Signals cut the railway into sections, so several trains can share the same tracks without running into each other. Once a train has passed a signal, the signal shows red for as long as that train is still in the section behind it. A second train has to stop there and may only go on when the section is empty again.
  • Trains book a path. Every signal is a path signal. It shows green as soon as the stretch this particular train will use, up to its next signal or stop, is clear and can be booked for it, so which stretch must be free varies from train to train and from route to route.
  • Stations are not signals. A station is not a signal. Even when it is a stop on the line, it does not split the track into sections.
  • Passing loops need signals. A passing loop only works with a signal at each end of the loop. Without them, two trains heading toward each other each try to book the line all the way to the other station, each blocks the other, and both stay put.

From the official manual

Why are my trains stuck?

The manual explains signals feature by feature. Here they are sorted by the problem you see in your game, with the rule behind it and what to change.

What do you see?

Two trains wait forever at opposite ends of a single line with a passing loop

Why
  • A passing loop only works with a signal at each end of the loop. Without them, two trains heading toward each other each try to book the line all the way to the other station, each blocks the other, and both stay put.
  • A station is not a signal. Even when it is a stop on the line, it does not split the track into sections.
Fix
Add signals at both ends of the passing loop. Each train then only books the way into the loop, and the two can pass there.
See it drawn
A passing loop needs signals

Signal layouts, drawn out

Our own sketches, seen from above. The blue and orange bars are trains. A faint band in a train's color is a path it has booked; a dashed line is a path it wants but cannot book, and a red cross marks what is in its way. Each dot is a signal showing red or green, drawn on the right of the track as seen in the direction of travel.

One train per section

The blue train is still in the section behind the red signal, so the orange train waits. When the section is empty, the signal turns green.

A passing loop needs signals

Top: no signals in the loop. Each train tries to book the line all the way to the other station, but the other train stands in the way, so neither booking goes through and both wait forever. Bottom: a signal where each loop track ends. Each train only books the way into the loop, so both can leave and pass in the loop.

Room after a switch

Top: the signal stands right after the switch, so the waiting orange train still covers the switch and the blue train cannot turn off. Bottom: the signal is a full train length further on, the switch stays clear and the blue train can go.

One-way signals for right-hand running

One-way signals stand on the right of each track. A train may not pass them from behind, so trains heading right keep to the lower track and trains heading left keep to the upper one.

Double track, several sections

Each direction has its own track, and signals split each track into sections, so trains can follow one another a section apart instead of waiting for the whole line.

How signals work

Signals cut the railway into sections, so several trains can share the same tracks without running into each other. As soon as more than one train runs on a line, or several lines share a stretch of track, the manual recommends signals.

Once a train has passed a signal, the signal shows red for as long as that train is still in the section behind it. A second train has to stop there and may only go on when the section is empty again.

Every signal is a path signal. It shows green as soon as the stretch this particular train will use, up to its next signal or stop, is clear and can be booked for it, so which stretch must be free varies from train to train and from route to route. That is why two trains can pull into a station at the same moment over a crossover, as long as their two routes do not share any track. A booked path runs until the first of these on the train's route: the next signal, a tram lane, or a stop where the train turns back.

Until 1950 signals are semaphores with a moving arm; from 1950 they are lights. Both behave the same: an arm pointing up means go, a level arm means stop. Signals are in the TOOLS tab at the top of the track construction menu.

The sentence in the manual that calls every signal a path signal actually says "Transport Fever 2", but it stands on a page of the Transport Fever 3 manual.

Where to put signals

  • Single track: On single track with no signals in between, a departing train books the whole way to the far station. Track behind it is released as the train moves on.
  • Passing loops: A passing loop only works with a signal at each end of the loop. Without them, two trains heading toward each other each try to book the line all the way to the other station, each blocks the other, and both stay put.
  • After switches: Leave room after switches and crossings. A train held at a signal must not stick out over the junction behind it, so place the signal at least the length of your longest train past the switch. When a waiting train sits in another train's way and that train sits in the first one's way, neither can ever move. The manual calls this a deadlock.
  • Busy lines: To run more trains, stretch the loop into a full double track split into several signal sections, then add platforms so trains stop at different ones instead of queuing for the same one.
  • Stations: A station is not a signal. Even when it is a stop on the line, it does not split the track into sections.

One-way signals and right-hand running

Trains ignore a signal that faces away from them, so a route can keep to one track even when a second track runs right next to it. A one-way signal cannot be passed from behind. Build one-way signals on the right of each track to make trains keep right, or on the left to make them keep left.

To make a signal one-way, click it and pick YES in the One-way menu of its window. You can tell a one-way signal by its icon, which shows a white dot next to two black ones.

Platforms, priority and line warnings

A train chooses its platform at the last signal before the station. With the line window open, that signal shows a blinking arrow in the line's color. Every alternative platform you allow must be reachable from that signal, or the game warns you.

By default a train only books extra track ahead when it would otherwise have to brake, so a slow regional train can slip in ahead of an express. Give the express line a higher priority and its trains book track further ahead. Train and tram lines have priority buttons in the lower right corner of the line window.

Rebuilding tracks or moving signals can leave a line without a route. Such problems show up under the warning icon at the top of the screen, and the line manager marks the broken stretch with a red exclamation mark.

Trams and tram-trains

Trams marked Light Rail can switch between rail track and tram lanes on the road. Road lanes only run one way and book nothing, so the road part needs no signals at all.

What the manual does not say

  • What signals cost to build or to keep.
  • Any other kind of signal, such as pre-signals or entry signals. The manual only says that every signal is a path signal.
  • How much further ahead a higher-priority line books track.
  • A length in meters for the gap after a switch. The manual only says to leave room for your longest train, and train length depends on the vehicles in it.

Frequently asked questions

How do train signals work in Transport Fever 3?

Signals cut the railway into sections, so several trains can share the same tracks without running into each other. Once a train has passed a signal, the signal shows red for as long as that train is still in the section behind it. A second train has to stop there and may only go on when the section is empty again. Every signal is a path signal. It shows green as soon as the stretch this particular train will use, up to its next signal or stop, is clear and can be booked for it, so which stretch must be free varies from train to train and from route to route.

Why are my trains stuck at a signal?

Usually each train is waiting to book a path that another train is standing in. A passing loop only works with a signal at each end of the loop. Without them, two trains heading toward each other each try to book the line all the way to the other station, each blocks the other, and both stay put. Leave room after switches and crossings. A train held at a signal must not stick out over the junction behind it, so place the signal at least the length of your longest train past the switch.

How do I make a one-way signal?

To make a signal one-way, click it and pick YES in the One-way menu of its window. A one-way signal cannot be passed from behind. Build one-way signals on the right of each track to make trains keep right, or on the left to make them keep left. You can tell a one-way signal by its icon, which shows a white dot next to two black ones.

Do stations work as signals?

No. A station is not a signal. Even when it is a stop on the line, it does not split the track into sections. Add signals yourself where the line should be split.

How far from a switch should a signal be?

Leave room after switches and crossings. A train held at a signal must not stick out over the junction behind it, so place the signal at least the length of your longest train past the switch. The manual gives no figure in meters, because it depends on your trains.

Do tram-trains need signals on the road?

No. Trams marked Light Rail can switch between rail track and tram lanes on the road. Road lanes only run one way and book nothing, so the road part needs no signals at all.

How do I stop slow trains getting in front of an express?

By default a train only books extra track ahead when it would otherwise have to brake, so a slow regional train can slip in ahead of an express. Give the express line a higher priority and its trains book track further ahead. Train and tram lines have priority buttons in the lower right corner of the line window.

What is the difference between semaphore and light signals?

Only the look. Until 1950 signals are semaphores with a moving arm; from 1950 they are lights. Both behave the same: an arm pointing up means go, a level arm means stop.

Related tools and guides

Plan what your trains should carry with the production chain planner, and check where cargo can be unloaded in the cargo unloading guide. Passengers and cargo arriving in a town also make it grow, as the town growth guide explains. The guides page lists every guide.

Sources

All game facts on this page come from these pages of the official Transport Fever 3 manual; the drawings are our own:

  • Railway Signals (how signals work, path and one-way signals, track layouts, tram-trains and line priority; revised September 29, 2026)
  • Streets and Tracks (where to find signals and how one-way signals look; revised September 29, 2026)
  • Lines and Vehicles (platform choice, line priority buttons and line warnings; revised September 29, 2026)

Checked on October 6, 2026. Seen something different in game? Let us know.