List of all Narrow Gauge Locomotive used by Indian Railways

Here’s a concise list of narrow-gauge locomotives that have been or are being operated by Indian Railways:

1. ZDM-1: Built by Arnold Jung Lokomotivfabrik, used on the Kalka–Shimla Railway.
2. ZDM-3: Found on the Kalka–Shimla route and Kangra Valley route.
3. ZDM-4: Modified version of ZDM-3, used on Kangra Valley and other routes.
4. ZDM-4A: Variant used on Barsi Light Railway.
5. ZDM-5: Powerful locomotives operated on Pratapnagar and Dhaulpur narrow-gauge routes.
6. NDM-1: Articulated locomotive with two prime movers, used on the Neral–Matheran line.

These locomotives continue to run on heritage routes as of 2021.