The Glenfarg Railway Tunnels offer a cool walking adventure with two tunnels to explore: the southern one is straight with a bend, while the northern one is a continuous curve. You can start at GR 143118 and finish at GR 154149 for a total round trip of 4.8 km. The railway line opened in 1890, survived Beeching cuts, but closed in 1970 to make way for the M90 motorway. The area offers scenic views and a bit of history, like the tragic tale of the local Minister's death during World War 2. Overall, it's a neat spot to check out if you're into tunnels, trains, and a touch of local lore.