Mission state guide
Iron Road: when do I use the war horn and how do I stop the train?
Iron Road can look stuck before the war horn, while the train is moving, or after reinforcements disembark. The next action depends on the current state.
Quick answer
Destroy both armoured emplacements before sounding the war horn. When the troop train appears, intercept it if practical. If the train reaches the station or is derailed, do not assume the mission is over—check for surviving reinforcements and clear the force threatening the approach.
Check which Iron Road state you are in
State A — Armoured emplacements still active
Before signalling the assault, destroy the two armoured emplacements blocking it. Use AP as instructed by this Iron Road mission state; this is mission-specific guidance, not a universal ammunition rule for every fortified target.
State B — Ready to sound the war horn
Sound the war horn only after both required armoured emplacements are destroyed. The structured mission data contains an early-signal failure path where the allied assault advances into active defenses and suffers heavy losses, without establishing a hidden percentage, casualty count, or timing window.
State C — Enemy troop train inbound
Use the current mission intelligence about the moving train and attempt an intercept if practical. This page does not publish a fixed schedule, route, speed, lead distance, coordinate, moving-target formula, or train calculator.
State D — Train hit, stopped, or derailed
Check for surviving reinforcements that disembarked and continue clearing the force threatening the approach. Stopping or derailing the train does not prove that every transported unit was eliminated or that the objective is complete.
State E — Train reached the station
The train reaching the station is not automatically the end of the mission. Shift from intercepting the train to dealing with the reinforcement force it delivered around the arrival and approach state.
State F — Approach and reinforcement threat cleared
Primary progression is tied to clearing the relevant approach and reinforcement threat. For Iron Road, do not assume that every remaining enemy elsewhere in town or on the map must be destroyed.
Still stuck?
When should I sound the war horn?
After the two required armoured emplacements are destroyed. Do not signal the allied assault while those defenses are still active.
I sounded the horn early and the assault failed
The structured mission data includes an early-signal failure path where the assault proceeds while the defensive emplacements remain active. It does not establish an exact friendly casualty count or hidden loss percentage.
Do I have to destroy the train before it reaches the station?
An intercept is useful, but the structured mission data also contains a state where the train arrives and reinforcements disembark. Train arrival is not automatic mission failure; shift to dealing with the delivered force.
I derailed the train but the mission is still going
Check for surviving reinforcements that disembarked. Derailing or stopping the train does not prove that all transported units were eliminated or automatically complete the objective.
The train reached the station — did I lose?
Not automatically. Switch from train interception to clearing the reinforcement force around the arrival and approach state.
Do I have to kill every enemy in town?
Do not assume total map extermination. The structured Iron Road progression supports clearing the relevant approach and reinforcement threat; this answer is scoped to Iron Road.
Current-version note: this state sequence comes from an independent structured mission-data snapshot. Exact train timing, generated positions, moving-target lead behavior, and unusual scripting remain unresolved.
Avoid these state mistakes
- Sounding the war horn before both required armoured emplacements are destroyed.
- Treating AP as a universal rule for every fortified target rather than an Iron Road mission instruction.
- Assuming a train reaching the station is immediate mission failure.
- Assuming derailment automatically eliminates every reinforcement or completes the objective.
- Using a fixed train schedule, route, coordinate, or lead formula that this page does not establish.
- Treating the primary objective as total extermination of every enemy in town.
Why the mission can keep going
The current independent structured Iron Road mission-data snapshot documents two armoured emplacements before the war-horn assault, an early-signal failure path, train interception and arrival states, reinforcement disembarkation, and continued progression after arrival or derailment. This page organizes those facts as mission states. It withholds generated positions, raw event timing, train movement constants, formulas, medals, and achievement internals.
Iron Road mission states documentedCurrent-build limitsChecked Aug 14, 2026
The structured mission data documents two armoured emplacements before the war-horn assault, an early-signal failure path, train interception and arrival states, reinforcement disembarkation, and continued progression after train arrival or derailment. Fixed timing, coordinates, and moving-target ballistics are intentionally omitted.
Version context: Current structured Iron Road mission-data snapshot reviewed Aug 14; exact live-build train timing, generated positions, and unusual event behavior not independently human-tested
Still uncertain
- Exact live-build revision represented by the extract
- Generated emplacement and train positions
- Exact train timing and schedule
- Exact moving-target lead behavior
- Unusual mission scripting or bugs
- Whether every current Steam Iron Road bug report has the same cause
Evidence and verification context
- Current structured Iron Road mission data: The independent fan-run structured snapshot records the emplacement gate, war-horn failure path, train interception and arrival states, reinforcement disembarkation, and approach-clear progression. Raw timing, generated positions, and movement constants are intentionally not published.
- Current Steam Iron Road discussion inventory: Establishes current demand only. The discussion inventory is not used as evidence for the mission-state facts, train behavior, or exact timing.