Behind more than 70 million high-speed rail services a year lies a web of safety systems. At nearly 200 mph, even a single failure can have dramatic consequences.

What looked like a temporary dip in residential HVAC sales is increasingly appearing to be a longer-term shift toward repairs, driven by rising costs and regulatory changes.

Kali Muscle, Big Boy, and Rob team up for a brutal back workout that focuses on heavy pulling movements and raw strength. Set in a no-frills gym environment, the session features barbell rows, lat ...