Some of the biggest looming strike actions have been called off after the death of Queen Elizabeth II.
Unions representing Royal Mail postal workers and rail staff said that "out of respect for her service to the country and her family" they had chosen to cancel immediate strike action.
Queen Elizabeth II, the UK's longest-serving monarch, died at Balmoral aged 96, after reigning for 70 years.
Concerns grew about her health earlier on Thursday.
In reaction to the announcement, planned strike action by postal workers on Friday 9 September and RMT rail worker strike action on 15 and 17 September was suspended.
The train drivers' union Aslef also postponed its walkout planned for 15th September.
The Rail Delivery Group said train timetables would be normal now that strikes were not going ahead.
A spokesperson from the Rail Delivery Group said it welcomed the decision by the RMT to call off next week's strike action at a time of "national mourning".
"The whole railway family is united in sending our condolences to the Royal Family," the spokesperson said.
The TSSA rail union has also cancelled planned industrial action for September and said it will be "respecting the period of public mourning".