After another couple of miles, we come to another T junction.  This time we turn left, signposted Caldarvan Station and John Muir Way.  
Caldarvan Station today is a tiny hamlet of houses built around the original railway station.  Originally named Gartocharn Station, it opened in 1856 and was a stop on the Forth and Clyde Junction Railway which ran from Balloch to Stirling.
The line was not successful though as its stations were often miles away from the villages they purported to serve.  After closure in the fifties the track was removed and few artifacts now remain although it is still possible to make out traces of the platform at Caldarvan Station.

Shortly after passing Wester Cameron Farm buildings the road begins to rise steeply.  This is the ascent to Cameron Muir - a wild and lonely place.
This forms part of the John Muir Way, a 130 -mile (215-Kilometre) route which runs from Dunbar on the east coast of Scotland to Helensburgh in the west. It was opened in April 2014 to commemorate the Scottish conservationist John Muir who became founder of the United States National Parks Service.
The route is suitable for walkers and cyclists although some sections may be more suitable for off-road cycles.
Around Croftamie the route splits – where travellers have the option of taking the road route on the low-lying ground whilst the more ambitious can head up into the hills – as we are doing

The bridge is just wide enough to allow you to push your bike across.
This is one of the prettiest parts of the route.  Many years ago, Barnford Farm existed close to the bridge but little evidence of its structures survive today.
From the bridge we can see the Campsie Hills to the south with the distinctive Drumgoyne hill at the western end.
Once across the bridge we follow the farm track up the hill.  As we look down, we can see the enormous loop of the Endrick water as it circles the field below.  At times of heavy rainfall, the field is often flooded - and even today, after a fairly long dry spell there is still a pond of water in the middle of the field.
At the top of the hill we can see Dalnair Farm and Crow Hill lying below us.  

This section of path leads from where we parked the car to a section of what is known as the Rob Roy Way.  Rob Roy Way is a long-distance path running through the Trossachs from Drymen to Pitlochry.  It is less busy than the more famous and very popular West Highland Way which runs from Milngavie in the north of Glasgow to Fort William
The Rob Roy Way at 79 miles (127km) long, the route travels through some of the most beautiful scenery in the British Isles.
Marker posts confirm the route but it is advisable to have a good map with you as sometimes the posts can be few and far between.  Also, at many locations there is a choice of path and it can be frustrating to head off in the wrong direction for a couple of miles before realising.  There are not many people around to give directions!
After climbing for about fifteen minutes we came to a well-made forestry track.  We turned right onto it and continued to climb.
​The going was easy on a continuous gradient