Rail passengers are facing fresh travel disruption from strikes.Around half of Britain's railway lines are closed and only a fifth of services are running as thousands of workers at Network Rail and train operators stage two 48-hour walkouts starting on Tuesday and Friday.Picket lines have been mounted outside railway stations across the country in a repeat of what became a familiar sight last year.

Rail passengers are facing fresh travel disruption from strikes.Around half of Britain's railway lines are closed and only a fifth of services are running as thousands of workers at Network Rail and train operators stage two 48-hour walkouts starting on Tuesday and Friday.Picket lines have been mounted outside railway stations across the country in a repeat of what became a familiar sight last year.