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I cannot help with crew change locations I’m afraid, but there was a thread a couple of years ago that attempted to pin down a list of berthing and stabling locations across the entire network, you can find that here:
If you want to add Iarnród Éireann (Irish Rail) to the list for a complete picture of these islands, there are trains stabling overnight at: Dundalk sidings Drogheda Drogheda Train Care Depot Sligo Sligo sidings Longford sidings Dublin Connolly Dublin Connolly sidings Fairview DART Depot...