Drive up the Naramata FSR (from Smethurst Rd.) about 2.9 km. Just below a sharp curve right you will note a wide space to the left of the road, and a track heading into the trees. There is a wet area clearly visible at the entry. Park in the wide spot (facing downhill.) Follow the track until it dead-ends on the KVR. A short hike east takes you to the lower entrance to the tunnel. Look in, but do not enter as the floor is rough, and the tunnel subject to cave-in. In May, look for "hanging baskets of the purple penstemen flower. Return to where you joined the KVR, and ascend the track that climbs over the tunnel. Continue until below the cattle-guard, where by diligent search, and help of a cairn, you can find a trail into a concrete structure with a steel grill cover. This is a vent for the tunnel. Listen carefully for the sound of water dripping into the tunnel.

Back on the double-track, continue until the well-used part of the track turns right 270 degrees or so. 280 meters farther on, a double track departs on the left (cairn,) heading roughly northwest. You must make a choice: take the track or continue on up the tunnel trail to a great viewpoint. If you go to the viewpoint, you must return to the double track to pick up your journey.

The double track (Stationmaster’s trail) soon gains greater definition, finally descending to the KVR at the Adra station. There you will spot lilac bushes planted long ago, yet still surviving and attracting butterflies during the spring bloom. (Poppies still bloom here until midsummer) Search near the lilacs for the foundation of the station house. Farther north along the KVR is the foundation of the water tower. After inspecting these historic relics, follow the KVR south to the tunnel bypass trail. A short hike onward on this level of the KVR will put you at the upper or north entrance to the tunnel. You can squeeze past the blocks on the east side, and follow the smooth rail-bed as far as the ventilation hole, about 80 meters in. There is water (not deep) standing below the vent, so take care. Return to the bypass trail and descend it. Continue along the KVR (south!) until you spot your access point, then descend that road to the trailhead.