The Indrayani Express is an express train that plies daily between the cities of Pune

Pune

Pune , is the eighth largest metropolis in India, the second largest in the state of Maharashtra after Mumbai, and the largest city in the Western Ghats. Once the centre of power of the Maratha Empire, it is situated 560 metres above sea level on the Deccan plateau at the confluence of the Mula ...

 and Mumbai

Mumbai

Mumbai , formerly known as Bombay in English, is the capital of the Indian state of Maharashtra. It is the most populous city in India, and the fourth most populous city in the world, with a total metropolitan area population of approximately 20.5 million...

 in India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

. It is operated by the Indian Railways

Indian Railways

Indian Railways , abbreviated as IR , is a departmental undertaking of Government of India, which owns and operates most of India's rail transport. It is overseen by the Ministry of Railways of the Government of India....

 and comes under the Central Railway Zone and is one of the six point-to-point express trains that carry thousands of passengers daily between Pune and Mumbai, the other five being Sinhgadh Express, Pragati Express

Pragati Express

The Pragati Express is a daily express train plying between the cities of Pune and Mumbai in India. It is operated by Indian Railways and comes under the Central Railway zone...

, Deccan Queen

Deccan Queen

The Deccan Queen डेक्कन क्वीन or Deccan Queen Express, , is an Indian passenger train that connects Mumbai with Pune. It is a daily means of transport for thousands of passengers travelling between the two cities...

, Deccan Express and Intercity Express.

The Indrayani Express is named after the river Indrayani

Indrayani River

The Indrayani river originates near Lonavla, a hill station on the Mumbai-Pune highway. Fed by rain, it flows east from there to meet the Bhima river, through the religious villages of Dehu and Alandi, and north of Pune....

 flowing near Pune.

The Train earlier numbered as 1021 while running from Mumbai to Pune and 1022 from Pune to Mumbai, has now been upgraded to superfast

Superfast Mail/Express

Superfast Mail/Express trains are faster Express rail service of India with Superfast charge levied over Mail/Express charges. Superfast trains make small number of stops, unlike Mail/Express and hence cover the same distance in marginally lower time span, as compared to their counterparts...

 & renumbered as 12525 (Mumbai CST - Pune Junction) & 12526 (Pune Junction - Mumbai CST).

Runaway Train Incident

On the night of 1st December 1994, the Indrayani Express lost braking power after a locomotive fire near Thakurwadi cabin on the steep Bhore Ghat section between Karjat

Karjat

Karjat is a city, a Municipal Council, a Tahsil and a sub-district in Raigad district, Mumbai, Navi Mumbai in the Indian state of Maharashtra.-Geography:...

 and Lonavala. The runaway train travelled at over a 100kmph on the downhill section till it rolled to a stop in the plains. The exact reasons behind the incident are still unknown. http://www.irfca.org/members/archive/messages.php?index=336