Extreme heat and infrastructure breakdowns led to massive delays for commuters in the Northeast this week, affecting tens of thousands of travelers. Rail service between New Jersey and New York's Penn Station was suspended due to Amtrak overhead wire issues. The disruptions hit during a heat wave, with a circuit breaker failure and brush fire adding to the chaos. Amtrak and New Jersey Transit trains share a tunnel, making it the only connection between Manhattan and the rest of the Northeast Corridor. Extreme heat can strain infrastructure, causing delays and potential dangers like derailments. Experts warn that climate change will continue to impact mass transit systems, leading to more delays and cancellations. Frustrated commuters expressed hope for improved service as infrastructure issues continue to plague the region.