WORTHINGTON'S WORKSHOP

Whitton Memorial	Knapsack Viaduct

John Whitton is remembered for building the Blue Mountains Line and much of the Great Southern Line, plus two Zig Zag formations; the Greater near Lithgow and the smaller at Lapstone. The town of Whitton, NSW and the John Whitton Bridge in Meadowbank, NSW are named after him. In the Blue Mountains, Whitton built many durable bridges and other constructions from locally quarried sandstone to effect cost savings for the money strapped government of the time. For example, the Stonequarry Bridge at Picton cost 1/10th of the similarly sized steel bridge at Menangle.

The Greater Lithgow Zig Zag was opened in 1869 to descend 143 metres down the western escarpment of the Blue Mountains into Lithgow valley. It was bypassed in 1920 by a series of 10 tunnels. In 1990 the track bed became part of the 3'6" gauge ZigZag Railway Preservation Society. The smaller Lapstone Zig Zag is found on the eastern escarpment of the Blue Mountains near Lapstone, and contains the Knapsack Viaduct.

Information Display

Knapsack Gully, a deep ravine containing Jamison Creek, was crossed by a sandstone arched viaduct, 118 metres long, 38 metres high and 5.5m wide carrying a single track. Work was begun in 1863 and completed in 1865. Due to the opening of the Glenbrook Gorge Deviation through the Old Glenbrook Tunnel, the viaduct fell into disuse between 1892 and 1926 when it was then used as part of the Great Western Highway. Widening to nine metres took place in 1939 to accomodate two lanes of road traffic. Road usage was superseded in the mid 1990's by the opening of the freeway. The present rail line through Glenbrook Gorge was opened in 1912.

Recommended for this walk would be a good pair of hiking boots and decent socks for the stony walk along the upper unpaved track bed. Ensure you have adequate water plus film and/or fresh batteries for your camera. This walk is a great invitation to photography. Travel west along the Great Western Highway from Penrith. Do not take the freeway. Cross the Nepean river on the Victoria bridge and continue through Emu Plains. Drive straight through the Russell Street intersection (the turnoff to the freeway).

Original railway trackbed	Knapsack Viaduct top

Curve right going up the hill for one kilometre and cross the railway line. The highway ends abruptly in the parking area with the turn around loop. Park in front of the park. The one way street near the entrance is the exit of the scenic Mitchell's Pass road from Blaxland - well worth a visit in itself. The freeway is also signposted for the Knapsack Zig Zag on the Emu Plains exit at Russell Street. A footpath follows the old railway trackbed to cross the viaduct and then proceed to the freeway.

The park contains a relatively flat area of a size that would indicate the previous presence of a rail yard. In the centre stands the John Whitton Memorial Obelisk and further east towards the present rail line is a derelict sandstone point keepers hut. The paved path departing south from the car park is over the original track bed, with the widened cutting due to the later use as a two lane highway. Less than thirty minutes of walking on a reasonably flat path through bushland will see you at the viaduct. You will be amazed at the sounds of the seemingly invisible bellbirds ringing from the nearest trees.

Cumberland Plains	Knapsack Viaduct

From the viaduct are two paths; one descends below the viaduct then climbs to Elizabeth Lookout, the other from the western side of the viaduct immediately climbs steps up to the old zig-zag railway formation at Top Points. From here take in spectacular views across the Cumberland Plain.Walk the upper road to Knapsack street, or the middle road down to Knapsack Quarry . From the highway, continue south to Skarratt Park South and the Old Glenbrook Tunnel, or return back to Knapsack Viaduct on the paved path over the original trackbed.

Cross the viaduct and take the uphill steps immediately at the end of the viaduct. Take about ten steps to the small viewing platform for magnificent views of the viaduct and the gorge. You can divert here to go under the bridge, down into the gorge and up the opposite side to Elizabeth Lookout and Marghes Lookout. Continue on the steep climb for about 15 minutes to near the top of the hill. Once there you are immediately at the location of the buffer stops of the Top Points.

Lucasville Platform	Upper & Middle Roads

The views from here are the spectacular panorama of the Cumberland Plains. Follow the dusty trackbed south from Top Points for 10 minutes and you will be at Lucasville Platform. This was originally built in 1878 as a station to enable access to the holiday house of Hon John Lucas, Minister for Mines. Stone steps ascend to the location of the now burnt down house. The station closed in 1892. Immediately south of the station the trackbed splits into the Upper and Middle roads. Take the Middle road for a 20 minute walk through a narrow cutting to the flat area of the Quarry.

Either return to the Upper/Middle Road Points and head along the Upper Road, or continue through the Quarry to get back onto the Upper Road. A 30 minute walk will see you at the southern entrance to the track at Knapsack Street Glenbrook, near the Glenbrook RAAF Base. Return straight along the Upper Track to Top Points, descend the steps to the viaduct, turn left to cross the viaduct and head north to Knapsack Park.

Top Points above the viaduct	Cutting into the Quarry

The overall walk took about three hours with time out for photography and a small rest at the top of the steps.To avoid the stair climb from the viaduct to the Top Points, make two smaller walks along the trackbed with the second beginning from the Knapsack Street entrance.

In 1831 the Surveyor General, Major Thomas Mitchell proposed a road up the eastern escarpment of the Blue Mountains. He employed David Lennox, a master stone mason newly arrived from England in 1832, to constuct the stone single arch bridge to cross a deep gully. It was completed in July 1833 as the first stone bridge on the mainland, and remains the oldest surviving stone bridge on mainland Australia.

The bridge was built by a gang of hand picked convicts and used for over 100 years as the main route across the mountains. After closure it was strengthened in the 1970's and reopened for light traffic in 1982. Access to the one way Mitchells pass is from the lights at the Layton Street (MacDonalds corner) turn off from the Great Western Highway at Blaxland.

The Quarry	Lennox Bridge