There could be other reasons. One is autos are available pretty frequently compared to trains. Second is passengers need to walk a lot and may be use a FOB for trains, while autos are available at the doorstep (as per article). This not only saves time, but trouble of buying a ticket in a queue, walking/climbing up to the platform. It could be the same at the destination, too. walk/climb to exit the station and use another mode of transport to reach home/office/market, whatever. Another is while you are buying ticket, train arrives. If it leaves before you can catch then the wait and the frustration associated with standing in queue and walking/climbing might make one use autos. These look like shared autos, charging per passenger basis stuffing 6-8 passengers. That way they become the preferred mode.