I have a strange feeling that catenary was upgraded on GWE route. I don't know it is because how it looks on this version of Unreal Engine or it is entirely missed shoot. Now, I know that preserved content was suppose to come... well, preserved not remastered, however seeing remixed audio it makes me think. Open door for future DLCs...?
Hmm... I did not play GWE for a long time so I must be wrong. Anyway, it would be nice feature implemented.
As far as I remember in TSW they were modelled in different way than later released routes. This was first route with catenary and it was purely easthetic. It did not simulate power flow for the electric locos. I am sure some other users can explain it better than me...