PUNE WDM-3A with 51317 Karjat - Pune Passenger in its tow erupting black smoke while leaving from Ghorawadi..Flickr: click here

51317 Karjat - Pune Passenger departs from Kasarwadi as my Lonavala bound local arrives at place..Flickr: click here

Sirjee...basically all of them are diesel generators....to start them you will need to Crank them up...............Take for example the humble 3 phase suppling air-cooled generators used in most Shaadis and Parties......Basically all ALCOs/EMDs have multiple units of them....just bigger and more powerful....Attached Image Link:- click here