They’re on the red.
Do the Black from the visitor centre. You’ll eventually cross a ford which comes out behind a range of buildings called Grove House.
To get to the new sections starting with Transmission, turn right and pass a barrier after about 100m, beyond this the fire road goes left up a bank or straight on. You want to go up the hill.
It will track round to the right and then go straight up the hill to a crossroads after 300m or so. You have 2 choices here to get to the start of the trail.
– straight ahead up the fireroad up the hill through a few turns until you get to a turn off right after about 1.5km. Take this turn and this fire road will take you straight up to the start of Transmission.
– alternatively you can go right at the crossroads. This will take you past the start to accelerator to where Transmission exits the forest. Go past where it exits and you’ll reach the edge of the trees and you’ll see a big cut going left up the hillside. If you ride up here you’ll get to the fire road that takes you to the start. Look right where this fire-break crosses Transmission after 100m or so.
If you ride all 3 sections they’ll eventually bring you back to a large open area near to Grove House. You ride back towards the ford and turn right to get back on to the black which will take you up to Section 13 which up near the 4x track and the downhill hut.
Hamsterley isn’t the best for signage but there’ll be people around to ask if you’re not sure which way to go.