As it is very early morning the traffic is expected to be fairly quiet and no issues are expected but please be aware that there is a 20mph temporary speed restriction at Stowmarket due to a point replacement. Also note that at Stowmarket, a signal failure means that CO 391 is stuck at red and can be passed by pressing TAB.
Wherry Lines is one of the requirements for the Great Eastern Main Line route on the Steam Workshop. In order to see any of the Class 37 consists in this scenario, this requires you to own the Steam version of Wherry Lines. If you bought the route direct from Armstrong Powerhouse, the scenario will not be affected due to them being static consists.