How much does a train cost?

How much does a train set for the Janakpur-Jayanagar Railway cost? The answer is tricky as the unit cost stated by officials of the Government of Nepal and the unit cost figure forwarded by the Government of India differs hugely.

Officials of the Nepal government have stated that a set of five coaches (including double engine) cost Rs 500 million while the unit cost quoted by the Indian government is US $ 3.67 million. (The Kathmandu Post)