In a significant achievement for Indian Railways, the much-anticipated self-propelled Diesel Hydraulic Multiple Unit (DHMU) has successfully completed a crucial trial run on the historic Kalka-Shimla narrow-gauge line. The test, conducted on Tuesday, marks a pivotal turnaround for the project, which had been plagued by technical failures in earlier attempts.
A Historic Route and a Modern Challenge
The Kalka-Shimla railway, a UNESCO World Heritage site known for its breathtaking views and engineering marvel, presented a steep challenge for the modern DHMU. Since its arrival in March 2023, the train had struggled with the route's demanding gradients. Previous trial runs had to be abruptly halted near Dharampur and Barog due to persistent engine overheating, grounding the unit since September this year.
Engineering Triumph Over Technical Hurdles
The breakthrough came after a dedicated team from the Integral Coach Factory (ICF) in Chennai arrived at the Kalka yard. They undertook extensive repairs and modifications to address the core technical problems. Their efforts culminated in Tuesday's non-stop run from Kalka to Shimla, which railway officials hailed as a "big relief." An Ambala division spokesperson confirmed the success, stating, "The ICF team resolved the overheating issue."
Designed as India's first self-propelled narrow-gauge train of its kind, the DHMU features engines at both ends, eliminating the need for a separate locomotive. This design is touted as a modern successor to the iconic rail motor cars that have long served the route.
The Path Ahead for Passenger Service
With this hurdle cleared, the focus now shifts to the final steps before commercial debut. Officials announced that another trial run is expected later this week. Following all internal checks, the unit will require certification from the Commissioner of Railway Safety (CRS). "After all clearances, the unit will be certified for passenger operations. Once ICF gives the green signal, the final test will be conducted by commissioner railway safety," the spokesperson explained.
This successful trial revives hopes for the early induction of the DHMU into regular passenger service, promising a more efficient and modern travel experience on one of India's most picturesque mountain railways.
