PC Wheel Slip In Tunnels When Raining

I am running a Bakerloo Line train from Elephant and Castle to Harrow and Wealdstone using the "Spring Rain" weather preset. The train slips as if the rails are wet when in the underground portion of the route. Does anyone else have this issue?

 

Same issue.

 

This problem has already been posted, e.g. just a few threads down on the first page .... (link)

 

I guess we're all getting to this at about the same time - I was coming here to report it but see you have beaten me to it!!

 

Just noticed this yesterday, getting wheel slip inside the tunnel when there's wet conditions.