Terms: FRA Structural Requirements (9), 49 CFR Part 238 (147), FRA 49 (1330), Part 238 Structural Requirements (8),
Terms: Federal Railroad Administration Safety Standards (21), FRA safety standards (58), semi-monocoque (32400), monocoque (416000),
Terms: torsional rigidity (168000), steel honeycomb (1100), aluminum honeycomb (54600), steel foam (5610), metal foams (6180), metal foam (20900), steel foams (81), ultralightweight steel (7), porous structures (19100), energy absorption (339000), spray metal (49400),
Terms: aluminum foam (14900),
Terms: spray metal (49400), metal spray (49500), flame spray (39100), arc spray (5710), plasma spray (126000), thermal spray (277000), combustion coatings (15),
Terms: crash energy management (1080), train buckling (17), anti-climbing (1290), crash refuge (123),
Terms: derailment (1450000), derailments (281000), railroad accidents (210000),
Boolean: Amtrak AND "freight trains" (99000), "passenger trains" AND "freight trains" (129000),
Terms: track sharing (972),
New design renders passenger trains handicapped-accessible, compatible with freight trains