Both trains are correct. One of the routes is called a "Slip Route". This means that some coaches of the train are taken through the other route. So, both trains share part of the route. After a junction station, the slip route is diverted through a different track.
Other bloggers, please correct and/or elaborate on my explanation above.

@first blogger:
both are right, few boogies is deviated to hubli

@moderator: Jul 13 2009 (09:37PM)
few boogies are deviated to hubli and the rest to hydrabad

@first blogger:
The main train runs daily from Hyderabad Deccan to Tirupati via Guntakal Jn. bearing Train No. 7429.
The train also carries some bogies from Hyderabad which are detached @ Guntakal Jn. and attached to another connecting train going to Kolhapur (Chhatrapati Shahu Maharaj Terminus).
The route from Guntakal Jn. to Kolhapur is called a slip route in Railways Terms and also carries the same train No. For passengers, they have not to shift over to another train.
Here in this website for the convenience of the passengers, the same train is shown one more time with suffix - 'slip' to carry the above meaning.

@Kapadia : Feb 08 (12:23PM)
this train has almost equal number of coaches to both the destinations. you have three trains coming from Kolhapur, hyderabad and tirupathi to guntakal from 1 am as haripriya.exp and rayalseema.exp respectively.Here half the coaches from Kolhapur are to hyderabad and tirupathi bound rayalseema respectively. Half coaches from the hyderabad and tirupathi train form the haripriya exp and go to kolhapur. the leave guntakal by 2:30 am. so the train number for train staring from hyderabad and tirupathi and going to kolhapur is same as the original trains. they only change form guntakal and get the number of haripriya.exp

Both are correct as Rayalseema and Haripriya run togther from Nampally to guntakal.