AR HB1631

Establishes an 8,500-foot maximum length limit for railroad trains operating on main lines or branch lines in Arkansas

Defines "main line" as Class I railroads transporting 5 million or more gross tons annually or providing scheduled intercity/commuter passenger service, and "branch line" as secondary lines branching from main lines

Authorizes the Arkansas Department of Transportation to impose administrative penalties of $500-$1,000 per foot exceeding the maximum length, with additional penalties up to $250,000 if violations cause death or injury

Allows penalty amounts to be negotiated between railroad companies and the department based on violation severity, culpability, previous violations, and ability to pay

Declares an emergency clause making the act effective upon governor approval, passage without veto, or veto override, citing public safety and commerce efficiency concerns