The newly released BR Class 89 has - somehow - not been tested with the Mk 4, units it ran most of it's lifetime with. Anyway, the brakes refuse to release making it unplayable.
There are running sounds but they use the Class 86. Go here and you can download a patch to make the Class 89 work with the Mk4 stock https://backdatedtrainsim.weebly.com/misc-downloads.html There is another sound set available but it requires the AP Class 90 and Class 91 sound packs Peter