The Indian Railways Organization for Alternate Fuels has invited bids from developers for building a hydrogen fuel cell-based hybrid power train on the Kalka-Shimla narrow gauge section in Himachal Pradesh. The technology will be installed on the existing diesel-hydraulic trains that run in the region. Developers will be responsible for the design, supply, retrofitment, testing, validation, prove out, field trials, fuel cell, battery-based power stack modules, hydrogen storage, power electronics, and associated equipment and supervision for the train. The tender document specifies that the power train must be equipped with a Proton Exchange Membrane Fuel Cell as the primary energy source and a battery bank as the second power source, which must meet the peak power requirement. The deadline for the submission of bids was January 21, 2021.