According to the search results, the national rail strikes have taken place on the following dates:

• Friday 1 September 2023 (ASLEF Union)
• Saturday 2 September 2023 (RMT Union)
• Saturday 30 September 2023 (ASLEF Union)
• Wednesday 4 October 2023 (ASLEF Union)

It is important to note that the search results also mention that both the ASLEF and RMT unions have voted to continue striking for the coming months, and that unless a deal on pay, job security, and working conditions is reached between unions and rail operators, it is likely that strikes could continue for the rest of 2023. It is recommended to check the National Rail website or other reliable sources for the latest updates on the national rail strikes.