Old Railroad Grade and Gravity Car Loop

The tour data suggests an average duration of about 1 hour and 15 minutes for this 13 km mountain biking loop. However, this can vary based on your fitness level and how often you stop to enjoy the views or explore historical sites.

This loop is generally not recommended for beginners due to its sustained climbing and some rocky sections. While the gradient doesn't exceed 7%, the constant uphill on a rough surface can be tiring. Mountain bikers with 'pretty minimal experience' can complete it, but be prepared for a challenging ride. The Gravity Car Fire Road portion is rated 'Intermediate'.

The trail primarily consists of a wide fire road with a surface of crushed rock and dirt, though some sections are quite rocky. You'll experience a steady climb with gradients typically between 4% and 7%. Part of the loop, particularly Eldridge Grade, is known as one of the rockiest fire roads in the Bay Area, which might make you appreciate a full-suspension bike.

This route is rich in history and scenic beauty. You'll follow the path of the historic 'Crookedest Railroad in the World'. Notable stops include the Former Railroad and Gravity Car Station, the historic West Point Inn, and the Gravity Car Barn near the summit. You'll also find spectacular views of San Francisco, the Bay, and the Pacific Ocean from spots like the Railroad Grade Fire Road Overlook to San Francisco.

While the specific starting point for this komoot tour is near the West Point Inn, common access points for the Old Railroad Grade on Mount Tamalpais include parking areas near the Mill Valley side, such as the Mountain Home Inn or the Rock Spring parking lot. It's advisable to check current parking availability and regulations for Mount Tamalpais State Park before your visit.

The trail offers different experiences throughout the year. On clear days, you'll get expansive views of nine counties, including the Sierra Nevada. On foggy days, you might climb through clouds to see distant ridges emerge from a 'white and fluffy ocean'. Generally, spring and fall offer pleasant temperatures, but the trail can be enjoyed year-round, weather permitting.

Regulations for dogs on trails within Mount Tamalpais State Park can vary. Typically, dogs are allowed on fire roads and paved roads but must be on a leash no longer than six feet. It's always best to check the official Mount Tamalpais State Park website for the most current rules regarding pets before you go.

Mount Tamalpais State Park generally has day-use parking fees. There are no specific permits required for mountain biking on the fire roads like the Old Railroad Grade, but standard park entrance or parking fees may apply depending on where you access the park. Check the California State Parks website for current fee schedules.

Given the sustained climbing and some rocky sections, this loop might be challenging for younger children or families new to mountain biking. While the pitch is consistent, the overall effort required makes it less ideal for casual family rides. Families with experienced, fit teenage riders might find it enjoyable.

Yes, the route intersects with and utilizes several other trails. Significant portions of the loop follow the Old Railroad Grade Fire Road and Gravity Car Fire Rd Trail. It also passes through sections of the Old Stage Road, Hoo-Koo-E-Koo Trail, Matt Davis Trail, and Rock Spring Trail, offering opportunities to explore further.

Beyond the sustained climb and rocky sections, a unique feature is the 'Double Bowknot,' a series of four hairpin curves designed for the old railway to gain elevation. The downhill sections can be steep and fast. Keep an eye out for the Fern Creek and spring, and you might even encounter mountain biking pioneer Gary Fisher on the trail!