US train operator Amtrak is reporting disruptions to its north-east services due to the extremely low temperatures.
Due to extreme cold forecasted to impact the Northeast, #Amtrak will operate a modified schedule on the NEC & Empire Line on Tues, Jan.7.
Services have been suspended between Philadelphia and Baltimore, although it was not clear if this was weather-related.
Acela/Northeast Regional service is temp suspended btwn PHL/BAL due to mechanical problems involving the overhead electrical system.
As much of the US experiences a dangerous and severe cold spell, does the UK have anything to worry about?
As the US battles sub-zero temperatures, ITV News Washington correspondent Robert Moore illustrates just how cold it is in Minnesota.
Leaders across America are urging residents to stay in their homes as "polar vortex" batters the east coast after snowstorm Hercules.