I just learned from another travel forum of disruptions to train service from April through August 2015.
the best information i found was on the Renfe Press Office site: http://www.renfe.com/EN/empresa/comunicacion/incidencias.html
Translated through Chrome:
From next April 7 Renfe provides an Alternative Transportation Plan (PAT) for infrastructure works in the Granada-Bobadilla line that will run from that date and in the next four months.
This plan starts with the need to undertake work in various sections of the conventional gauge line Bobadilla-Granada, to adapt to the passage of high-speed traffic UIC gauge and the impossibility of making them compatible with maintaining the current service trains.
During this time transfers are carried by road between the stations of Granada and Antequera Santa Ana for relations Granada and Madrid-Sevilla-Granada-Almería and Granada-Algeciras. Thus, the service of the city of Granada guaranteed during the months in which the works on infrastructure are developed.
Alternative Transportation Plan (PAT)
Since April 7, all trains whose origin or destination Granada modify their service according to the following PAT:
Middle Distance Sevilla-Granada-Almería and Granada-Algeciras:. The regular dismissal time for all trains, which made transfer by road between Granada and Antequera Santa Ana is maintained The rest of the tour will train.
Altaria Granada-Madrid: The Altaria service will be suspended from April 7. Travellers transhipped by road between Granada and Antequera-Santa and held in AVE path between it and Madrid.
For the Madrid-Antequera Santa Ana usual routes route AVE trains used between Madrid and Malaga strengthened with a train Altaria Madrid-Antequera, Friday, and another to Madrid on Sunday. Thus, the number of travel options between Granada and Madrid, from 4 to 8 current daily Monday through Thursday doubles, and increasing to 9 Friday and Sunday:
Granada-Madrid (Bus + AVE): 4 services Monday through Friday, March 5 Saturdays and Sundays.
Madrid-Granada (AVE + Bus): 4 services Monday through Thursday and Sunday, 3 May Saturdays and Fridays.
Fares for travel between Granada and Madrid with these travel options (AVE + bus) remain unchanged from the current of Altaria service. In this temporary situation, the travel time between Granada and the capital of Spain in reduced AVE + bus around 35 minutes today used by Altaria trains.
The commitment to punctuality Renfe established in Madrid-Granada service during this interim situation is as follows:
More than 30 minutes Delay: 25% refund
Greater than 45 minutes Delay: 50% refund
More than 60 minutes Delay: 100% Money Back
For medium distance services, rates of compensation are:
More than 15 minutes to 30 minutes Delay: 25%
Delay exceeding 30 minutes and up to 60 minutes: 50%
More than 60 minutes Delay: 100%
As established a voluntary commitment to timeliness of Renfe, this compensation for delays will be performed whenever the delay is attributable to the operation of the service and not by fault or force majeure.
Renfe reinforce the staff at stations Granada and Antequera-Santa Ana in order to ensure assistance to travelers and easy movement between buses and trains.
The service Trenhotel Granada-Barcelona will not be affected as it flows through the Linares-Granada, outside the stretch of carrying out the works online.
The refurbishment of conventional gauge line Bobadilla-Granada to allow passage of high-speed traffic and require cutting the road to carry out the actions will be developed in various sections of the route, such as the Station Granada; the first phase of construction of platform and track access to the city of Granada; track renewal and permeabilization of the path between pp.kk. 59/560 to 86/520, with suppression of thirteen crossings, and Station of Antequera.