Amtrak will begin allowing passengers to carry firearms in personal lockboxes aboard an additional 1,500 trains per day starting January 2027, expanding a policy currently limited to secure baggage cars on a handful of long-distance routes. The Transport Workers Union, representing 360 onboard service workers, is calling the move "sheer lunacy" and demanding a reversal. The mechanics of the new policy are straightforward and worth examining. Gun owners bring their weapon in a case to an Amtrak station agent, who adds an Amtrak-owned combination lock. The passenger then carries the lockbox to their seat. At the destination, a station agent removes the Amtrak lock. The firearm travels in the passenger cabin for the duration of the journey. The union's objections center on a basic asymmetry: aviation prohibits firearms in the cabin entirely, requiring them to be checked and stowed in cargo. The new Amtrak policy puts weapons within arm's reach of their owners in confined spaces — with no TSA-equivalent screening infrastructure and, the union notes, many stations lacking any Amtrak staff or law enforcement presence at all. The scale is significant. The policy would apply to Amtrak's Northeast Corridor, its busiest service connecting Washington, New York, and Boston, which carries roughly 750,000 riders daily. This is not a niche long-distance route concession — it is a fundamental change to the security posture of the country's most heavily trafficked passenger rail corridor. The policy arrives under explicit pressure from the Trump administration to ease restrictions on transporting weapons, according to PBS reporting. Amtrak had previously signaled it was considering the change but had not committed to a timeline. The January 2027 date is the first concrete implementation target. The union raises a practical failure-mode question that deserves more attention than it has received: what happens when a lock or case is defective, or when a passenger decides to force one open? The scenario requires no conspiracy — a mechanical failure or a moment of rage in a moving train with no armed security response is the risk model. There is no air marshal equivalent on Amtrak. Amtrak did not respond to a request for comment. The silence is notable given the scale of the operational change and the direct safety challenge posed by its own workers' union.