Valley Heights Locomotive Depot Heritage Museum, Railway museum in Valley Heights, Australia

The Valley Heights Locomotive Depot Heritage Museum is a railway museum set on a large industrial site in Valley Heights, in the Blue Mountains of New South Wales. The site holds restored steam locomotives, heritage carriages, and railway equipment covering more than a century of rail operations.

The depot was built in 1913 when duplication of the Main Western line between Emu Plains and Glenbrook was completed, available for service from December 1913 and officially opened on 31 January 1914. It supplied bank engines for the climb to Katoomba, where the 33-kilometre section rises 670 metres at a ruling gradient of 1 in 33. Steam gave way to 46 class electric locomotives in February 1957, and the depot closed in 1993; the museum opened in 1994, and the site was listed on the State Heritage Register on 2 April 1999.

The museum keeps the depot's working identity: a 10-bay roundhouse, an 18.3-metre turntable and an elevated coal stage, where bank engines were prepared to push trains up the 1-in-33 climb to Katoomba. The Valley Heights Steam Tramway, set up in 1997 after fire destroyed the Parramatta Park Tramway in June 1993, runs historic steam trams and trains on the site.

The museum sits 400 metres north-west of Valley Heights railway station, on the Main Western line in the Blue Mountains. The depot grounds hold a 10-bay roundhouse, an 18.3-metre turntable and an elevated coal stage, so allow time to walk between them. Check opening days before travelling, as the site is run by volunteer partner organisations.

The depot's engines banked trains over the longest distance in New South Wales and worked the longest continual, most steeply graded mainline in Australia: the 33 km from Valley Heights to Katoomba climbs 670 m at a ruling gradient of 1 in 33. At the steam era's peak, about 30 trains in any 24 hours needed banking from here.