Trauma Shock Blanket Brief

Purpose and Scope

This brief proposes a Trauma Shock Blanket: one transit-compliant blanket stocked across NYCT work sites and stations, so that crews and station staff can preserve the body heat of an injured or ill employee or rider while they wait for EMS. It is a concept-level overview, not an implementation plan or a product selection.

Executive Summary

The need. Employees and riders can be injured or fall ill anywhere in the system, and on the right-of-way, reaching and extracting a patient takes especially long. During that wait, heat loss worsens outcomes.

The gap. Crews and Station Agents are often the only people with the patient, and they have no standard tool to keep that person warm.

The constraint. Mylar, the usual choice, is flammable and conductive, so it isn't suited to the subway.

The concept. One compliant blanket, stocked in response bags where it fits and at nearby stocking points where it doesn't.

The contribution. Field requirements and candidate products to support any evaluation of transit-grade alternatives. No custom product development is proposed.

Medical Basis

Keeping a patient warm is established emergency care, and one of the few interventions anyone on scene can provide.

Fact	Why it matters here
The Trauma Triad of Death	Hypothermia, acidosis, and impaired clotting develop together, often within minutes of injury, and each worsens the others. Heat loss is the one part of the triad a crew can act on before EMS arrives.
Cold impairs clotting	Even mild hypothermia slows platelets and clotting enzymes, which increases bleeding. A bleeding patient who is also losing heat deteriorates faster.
Cold on arrival raises mortality	Trauma patients who are hypothermic before reaching the hospital die at higher rates. What happens before EMS arrives affects outcomes afterward.
Surfaces, water, and air pull heat away	Contact with cold ground, wet clothing, and wind all speed heat loss. Track work puts injured workers on cold steel, concrete, and wet ground, often in tunnel airflow.
It is treatment, not comfort	Military trauma care (Tactical Combat Casualty Care) works through injuries in a fixed order called MARCH: Massive bleeding, Airway, Respiration, Circulation, and Hypothermia. Preventing heat loss is one of the five core steps, treated as lifesaving care in every climate, not as comfort. Warming belongs in first response year-round, not only in winter.
Time to care is longer underground	On the right-of-way, responders must reach the patient through tunnels, on elevated structures or in complicated work zones, and then carry them out. That stretches the window in which heat is lost.
Not only trauma	Shock, heart attack, stroke, fractures, and cold exposure all call for keeping the person warm while awaiting EMS, for employees and riders alike.

Field Requirements

Reflective mylar is the usual choice for passive warming, but it is flammable and conductive, so it isn't suited to the subway. Any alternative must first meet NYCT's transit material standards, including NFPA 130, and may need testing to confirm it. Beyond that, the qualities below reflect what a blanket has to do in the field, and for the patient.

Requirement	What it means
Insulating	Meaningfully reduces heat loss for a person lying on cold steel, concrete, or wet ground, and keeps working when damp
Non-conductive	No metallized or foil layers
Fits the kit	Compact enough for response bags where possible, since most insulating blankets are thicker than mylar; vacuum-sealed so it stays clean and dry until opened
One product, everywhere	The same blanket at every stocking point: red bags and trauma kits where the product allows, work trains, supervisor vehicles, station booth kits, crew quarters, and first aid stations in shops, yards, depots, buses, and offices. Where it won't fit a bag, stocking points close to the work keep the trip to retrieve one short
Skin-safe	Tolerable against bare skin and around the face
Fast to use	Opens and covers the person in seconds, covering the body and keeping the face clear, by anyone on scene, including while wearing work gloves
Easy to maintain	Checked and replaced during routine kit inspections; sealed packaging shows at a glance whether it has been used
Affordable at scale	Priced for systemwide stocking; compliant blankets cost far more than mylar, so bulk pricing matters

Candidate Products

The two candidates are a starting point, not a selection. Testing the stronger one is a smaller step than developing a new product.

Option	Fit and gaps
CandidateFire-retardant wool first aid blanket e.g., Sylprotec PS762, First Aid Only 21-610, Honeywell lightweight fire and first aid blanket	Already sold as a first aid item. Wool is naturally flame-resistant and insulates when damp, and these blankets have no metallic layer. Some are treated to NFPA 701, a textile flame test. Gaps: heavier and bulkier than mylar (about 2.7 lb for one example), about $65 to $168 each at retail (Canadian listings), and no listing found claims transit-grade smoke testing.
CandidateInherently flame-resistant synthetic blanket e.g., modacrylic escape blankets	Flame resistance is built into the fiber, so it survives washing, and the blanket is marketed for warmth and shock. Gaps: certified to a European protective clothing standard (EN ISO 11612) rather than transit standards, and U.S. supply would need to be confirmed.
Not a candidateReflective mylar emergency blanket the standard EMS and disaster-response space blanket	Previously proposedIdeal on size and cost: under 2 oz, packs to about 4 × 4 × 0.5 in, and well under $1 each in bulk, so it fits any kit. Ruled out because the film is flammable and its metallized coating is conductive near energized equipment.
Not a candidateCustom transit-compliant rescue blanket a four-function composite	Previously proposedA purpose-built blanket for warming, flame protection, fire suppression, and smoke shielding, with a fiberglass, aramid, or basalt base, a silicone or PTFE coating, a reflective thermal laminate, and an optional aramid fleece layer, engineered to NFPA 130. Ruled out because it would require new product development, testing, and certification before use; it would weigh 2 to 5.5 lb; its reflective laminate would need to be confirmed non-metallic; and a blanket used to smother a fire is not one to then place on a patient.
Not a candidateFire suppression blanket e.g., blankets tested to NFPA standards for heat blocking	Built to smother flames and shield against heat, not to warm a patient.

Conclusion

Improving outcomes before EMS arrives.

A Trauma Shock Blanket gives every crew and station a compliant, simple way to protect an injured or ill employee or rider while waiting for care, within the material standards NYCT already holds.

DisclaimerThis is an independent concept developed by a New York City Transit employee. It is not an official MTA or NYCT document and is not endorsed by MTA NYCT. It is shared for discussion only and is not policy, a commitment, or legal or medical advice. Materials and standards named are examples for evaluation, not product endorsements. Any use would require agency review and approval.