(S) Saint-Martin-des-Champs community hall
(1) From the community hall, walk down the main street, past the town hall and then the church, and turn onto a small path on the left. Turn immediately right and join the old railway line. Go through the tunnel under the old railway line, turn first left then right, and cross the bridge over the Grand Morin. Continue until you reach a Fork in the road.
(2) Take the path on the left to join a tarmac road. Take this road and follow it to the Moulin de la Fosse crossroads.
(3) Take the road on the left, which will lead you to Trotignon, the starting point for the Vallée du Grand Morin rail bike.
(4) In Trotignon, turn right. Keep left at the first Fork in the road, then turn right at the next T-junction. Continue straight on (east, then east-north-east) until you reach a crossroads.
(5) At the crossroads leading to Montvinot, turn left, then take the road on the right and immediately turn left. Continue straight on along the grassy track between the fields until you reach the D14.
(6) Take the D14 to the right, then turn left straight away and follow the grassy track uphill for about 600 metres.
(7) At the junction, take the path on the left until you reach the Route de La Grande Renoue (tarmac road), then take the path immediately on the left. Follow it to the T-junction, ignoring the turnings to the left and then to the right.
(8) Turn right and, after about 600 metres, turn right again to head back up towards the village of Coupigny.
(9) In Coupigny, turn left, then right, then left again, and take a grassy track, following it to the junction.
(10) At the end of this grassy path, turn left and carry on straight ahead to return to Saint-Martin-des-Champs. At the end of the path, continue along the tarmac road to return to your starting point.