☣️ UN 0492 • CLASS 1
Signals, railway track, explosive
Placard: Explosive 1.3G. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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Quick details
UN 0492
Class: 1
Placard type: Explosive 1.3G
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: isolate 500m in all directions; if fire or explosion involved, evacuate 1600m radius; avoid direct contact or shock
Chemical & Response Details
| Also known as | Railway track signalsRailroad track torpedoesTrack warning devicesDetonating railway signalsTrack detonators |
| Appearance | Small explosive devices, typically metal or plastic casings containing primary explosives, designed to be placed on railroad tracks to produce audible warning signals. |
| Flash Point | Not applicable (explosive article) |
| Boiling Point | Not applicable (explosive article) |
| Vapor Density | Not applicable (solid explosive device) |
| Water Reactivity | No significant reaction with water under normal conditions |
| Extinguishing | Do not use foam or water on burning explosives; use dry chemical or sand from safe distance |
| PPE | ⚠️ Level B minimum with full face SCBA; blast-resistant gear recommended; maintain safe distance due to fragment projection risk |
| Isolation | ERG 112: isolate 500m in all directions; if fire or explosion involved, evacuate 1600m radius; avoid direct contact or shock |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Fire and burning hazard — not mass explosion.
- Intense heat and possible fragment projection.
- May deflagrate and initiate other materials.
- Smoke and toxic combustion products.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper.
- Isolate area; stage upwind — fire and fragment hazard.
- Request Hazmat + law enforcement.
- Control ignition sources; deny entry.
- Consult current ERG Guide 112 and follow SOP/SOG.
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UN 0492 — Signals, railway track, explosive HAZMAT RADIO NOTE — UN 0492
Product: Signals, railway track, explosive
Class 1 / Explosive 1.3G / ERG 112
PPE: Level B minimum with full face SCBA; blast-resistant gear recommended; maintain safe distance due to fragment projection risk
ISOLATION: ERG 112: isolate 500m in all directions; if fire or explosion involved, evacuate 1600m radius; avoid direct contact or shock
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 0492 — Signals, railway track, explosive
Class: 1 | Placard: Explosive 1.3G | ERG Guide: 112
Appearance: Small explosive devices, typically metal or plastic casings containing primary explosives, designed to be placed on railroad tracks to produce audible warning signals.
Water Reactivity: No significant reaction with water under normal conditions
Extinguishing: Do not use foam or water on burning explosives; use dry chemical or sand from safe distance
PPE: Level B minimum with full face SCBA; blast-resistant gear recommended; maintain safe distance due to fragment projection risk
Isolation: ERG 112: isolate 500m in all directions; if fire or explosion involved, evacuate 1600m radius; avoid direct contact or shock
— Key Hazards —
• Fire and burning hazard — not mass explosion.
• Intense heat and possible fragment projection.
• May deflagrate and initiate other materials.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper.
• Isolate area; stage upwind — fire and fragment hazard.
• Request Hazmat + law enforcement.
• Control ignition sources; deny entry.
SOURCE: allfirefighter.com/hazmat/un/0492 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0492 Signals, railway track, explosive Cls1 ERG112 | allfirefighter.com/hazmat/un/0492SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/0492
Related UN numbers (same class)
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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FAQ
Fire and burning hazard — not mass explosion. Intense heat and possible fragment projection. May deflagrate and initiate other materials. Smoke and toxic combustion products.
CALL 911. Then call emergency response telephone number on shipping paper. Isolate area; stage upwind — fire and fragment hazard. Request Hazmat + law enforcement.
Level B minimum with full face SCBA; blast-resistant gear recommended; maintain safe distance due to fragment projection risk
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 112 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles. This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.