6N42 and its return 6F42 is the service that takes general goods (in cargowaggons) to the Gilbraiths depot at Blackburn, its routed WCML-Farington Junction-East Lancs to Blackburn station. It was producing 37s regularly at one point but Ive seen it with 66s and 67s aswell.
Everytime Ive seen this train its been coming off the Lostock Hall lines around 08:00/30, Ive never seen its return working though.