It's not coal- its cement I think.
Warrington-Ellesmere Port.
Freightliner Heavy Haul. (class 66 and hoppers).
2 a day (each direction). Don't know what time the early one runs, but the late one runs past Helsby between 2.30pm and 3.30pm.
Best place to view is Ince & Elton Level Crossing or Ellesmere Port footbridge. You'd have to get an earlier Merseyrail service though, because the freight crosses over to the DC rails (therefore blocking the platform), before heading on to the 5mph unsignalled Manchester Ship Canal branch to the cement works.
The other freight through Helsby is the wood from Carlisle-North Wales.