Passengers traveling on the historic Kalka-Shimla rail route will soon get a modern upgrade. Indian Railways is preparing to launch the Diesel Hydraulic Multiple Unit (DHMU) train on this UNESCO World Heritage site. The train has undergone several tests and is now nearing its commercial launch.
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What is the DHMU train and its special features?
The DHMU is a self-propelled train set specifically designed for the narrow-gauge tracks of the Kalka-Shimla route. Unlike traditional trains, it has engines at both ends, which means a separate locomotive is not needed to pull the coaches. This design will improve operational efficiency and provide better facilities for tourists and daily passengers.
What were the technical challenges and current status?
The project faced delays due to engine overheating issues that started in March 2023. To fix this, the Integral Coach Factory (ICF) Chennai deployed engineering teams to modify the cooling system. Recent updates confirm the following progress:
- Successful trial runs were completed on May 25, 2026.
- The Ambala Division confirmed that technical glitches have been resolved.
- ICF Chennai will now submit a detailed report to the Commissioner of Railway Safety (CRS).
The train will start passenger services only after the CRS conducts a final independent safety inspection and gives the official approval.
Frequently Asked Questions (FAQs)
What is the main advantage of the DHMU train on the Shimla-Kalka route?
The DHMU train is self-propelled with engines at both ends, eliminating the need for a separate locomotive and improving efficiency on the narrow-gauge track.
Why was the launch of the DHMU train delayed?
The launch was delayed due to engine overheating issues. These were resolved in May 2026 after the ICF Chennai and Railway Board modified the cooling system.