Yes, but only a few
Most of the India’s Narrow Gauge network was converted to Broad Gauge under the Unigauge Project, narrow gauge trains mainly survives as heritage or tourist railways
Due to Uneven Terrain, challenging Ghat section, it is not possible to convert into broad Gauge and electrify, Some narrow gauge routes are certified as World UNESCO World Heritage Site.and con
⭐Some operational narrow-gauge lines include:
1. Darjeeling Himalayan Railway (2 ft / 610 mm gauge) in West Bengal
From New Jalpaiguri Jn-Darjeeling
2. Kalka–Shimla Railway (2 ft 6 in / 762 mm gauge)
3. Matheran Hill Railway (2 ft / 610 mm gauge) in Maharashtra
From Nerul-Matheran
4. Kangra Valley Railway (2 ft 6 in / 762 mm gauge)
From Pathankot-Joginder Nagar
4. Bilimora–Waghai line in Gujarat (one of the last non-hill narrow-gauge routes).
In South India, Tamilnadu, there are no operational Narrow Gauge lines now.
The famous Nilgiri Mountain Railway is still running, but it is metre gauge (1,000 mm), not narrow gauge
In Future there Heritage railways such as Darjeeling Himalayan Railway, Kalka–Shimla Railway, and Matheran Hill Railway are likely to continue because they are major tourist attractions and have heritage value
whereas Non Hilly Region Narrow Gauge route especially Bilimora-Waghai Route might be converted into Broad Gauge line if Indian Railways find it economically Beneficial.