The Heathrow Express between London Paddington and Heathrow airport was reduced to a skeleton service early this week as RMT union members struck.
The 24-hour strike started at 12.15pm on Sunday. It will be followed by another 24 hours at the same time on Sunday 11 March if the dispute is not resolved.
RMT members are angry at the sacking of driver Zahid Majid and victimisation of union rep Liaqat Ali.
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