Here is the travel advice from Northern, as listed on the National Rail website:
You should continue your journey using the alternative suggestions below.
You can travel on the following train operators and routes at no extra cost:
TransPennine Express services via any reasonable routeAvanti West Coast services between Manchester Piccadilly and CreweTransport for Wales services between Manchester Piccadilly and Crewe
You can also use your tickets at no extra cost on board the following Bee Network services:
Metrolink tram services via any reasonable routeBee Network Bus services 43, 103, 248, 313, 368 and 50
Please note that other train operators may also be affected by disruption – please check your whole journey before travelling.
Northern train ticket restrictions have been lifted in the affected areas, including Advance and Peak restrictions, during this disruption. Restrictions will be reinstated once the disruption ends.