Da Lat–Thap Cham railway

Swiss engineers, who had experience at building zigzag railways for use on steep slopes, were hired to complete the line. Initial surveys took place in 1898, and construction began on the Tháp Chàm–Sông Pha section in 1908.[7] By 1913, tracks had reached the town of Tân Mỹ, and the first trains began to use this portion of the line. The rest of the Tháp Chàm–Sông Pha section opened in 1919, completing the first phase of construction.[1]

The Ngoan Muc Pass, along which the railway travelled

The second phase took comparatively more time to complete, due to the mountainous terrain inland from Sông Pha (Krongpha). Although the following section, from Sông Pha to Eo Gio (Bellevue), was only 10 km (6.2 mi) long on a map, its steep grade (120‰) required the use of a rack and pinion system. The Sông Pha–Eo Gio section was completed in 1928. The next section, from Eo Gio to Đơn Dương (Dran), was relatively flat, and was completed in 1929. From Đơn Dương to Tram Hanh (Arbre Broyé), another length of rack rails was laid, this time with a grade of 115‰ and with a more meandering route than previously; this section was completed in 1930. The remaining distance from Tram Hanh to Da Lat was said to be the most difficult, as it crossed the Lam Vien Plateau, 1,500 m (4,900 ft) above sea level. The terrain was again relatively flat from Tram Hanh to Da Tho (Le Bosquet), but required the construction of three railway tunnels; finally, the Da Tho–Trai Mat section, which was the final rack rail section with a grade of 60‰, was laid down; the railway tracks finally reached Da Lat in 1932. The section linking Sông Pha to Da Lat was only 43 km (27 mi) long, but rose almost 1,400 metres (4,600 ft) along a winding route with three rack rail sections and five tunnels. Da Lat Railway Station, one of the first colonial-style buildings to be built in the area, was completed in 1938.[8][9]

Throughout the Vietnam War, the entire Vietnamese railway network was a target of bombardments and sabotage by both North Vietnamese and South Vietnamese forces.[10] The Da Lat–Tháp Chàm line was no exception; plagued by sabotage and mining by the Viet Cong, the line gradually fell out of use, with regular operations coming to an end in 1968.[1]

After the Fall of Saigon on 30 April 1975, the Communist government of the newly unified Vietnam took control of the former South Vietnamese railway. Heavily damaged by bombing and sabotage by both North Vietnamese and South Vietnamese forces and their allies, the war-torn North–South railway line was returned to service on 31 December 1976, promoted as a symbol of Vietnamese unity.[2] Many abandoned railway lines—such as the Da Lat-Tháp Chàm line—were dismantled to provide materials for the repair of the main line; unused materials were sold as scrap metal.[1]

A diesel locomotive prepares for its return trip at Trại Mát station.

In the 1990s, a 7 km (4.3 mi) section of the line between Da Lat station and the nearby village of Trại Mát was restored and returned to active use as a tourist attraction.[3] A planning document released later, in 2002, listed the restoration of the entire Đà Lạt–Tháp Chàm railway as a priority for infrastructure development for Đà Lạt and Lâm Đồng Province, including the upgrading of Da Lat station and other stations along the routes to handle passenger and cargo transportation.[11] The proposed renewal received the backing of provincial and local governments, and the national government indicated that private companies would also be allowed to participate in the reconstruction of the railway. The project would also include a connection to the North–South railway at Tháp Chàm, allowing trains to circulate between Da Lat and the rest of the country for the first time since the Vietnam War.[4] In December 2009, four rail cars restored to look like the rail cars used on the Da Lat–Tháp Chàm line in the 1930s were put into use on the Da Lat–Trại Mát tourist railroad, carrying signage reading "Dalat Plateau Rail Road".[3]

A steam locomotive at Da Lat station

Furka Dampfbahn number 1 which was VHX 31-201 in between

Soon after the first part of the railway line was opened, the French Compagnie Des Chemins De Fer De L'Indochine (CFI) set about importing cogwheel locomotives that could be used also on rack sections. CFI initially purchased five HG 4/4-type[nb 2] locomotives in 1924 from Swiss manufacturer SLM Winterthur (German: Schweizerische Lokomotiv- und Maschinenfabrik). 1929 two locomotives followed from German manufacturer ME (German: Maschinenfabrik Esslingen), built after the Swiss plans as a so-called "Reparationsleistung". In 1930 SLM delivered another two locomotive, bringing the effective to nine. These locomotives were delivered as numbers 301 through 309 and later were given the serial numbers CFI 40-301 through CFI 40-309. Four locomotives (301, 305, 307 and 309) were destroyed during World War II during the Japanese occupation of Indochina. 1947 it was possible to purchase four similar but slightly less powerful locomotives from the Swiss Furka-Oberalp company which had electrified its lines a few years ago. These were HG 3/4-type[nb 3] locomotives (given serial numbers CFI 31-201 through 31-204). The locomotives were transferred to a Vietnamese railway company, Vietnam Hoa Xa, after the dissolution of French Indochina; the serial numbers remained the same, but with VHX rather than CFI as a prefix. The locomotives functioned on steam, generating a pulling power of 600–820 cv.[1]

The remains of the Furka-Oberalp steam locomotives were repurchased by the Swiss Furka Heritage Railway together with the two locomotives 40-304 and 40-308. It was intended to use them on the restored original Furka rack line. Two locomotives (31-201 and 31-204) were returned to active service[16] with their original numbers 1 and 9.

• Diesel locomotive TU7A
• Diesel locomotive TU8P