Public transport:
Bus 54 or 25 to Kjelsås station.

Trikk 12 or 15 to Kjelsås, walk 4 minutes to the train station,

Train R30 towards Gjøvik, or R31 toward Jaren, get off at Kjelsås station

Driving: Free parking around the station after 1700. Also parking around Teknisk Museum, since its closed on Mondays 😉w

Run starts behind Teknisk Museum. Bag drop in hash car, circle outside – so dress accordingly.
 
Walkers & runners trail, with a mix of asphalt & nature. Not very bike or stroller friendly, but manageable.