OK. (Its actually the train from Barcelona)
On the Renfe site, under Horarios - don't enter any stations in the search blocks.
Click on Ver
Todas las Estaciones underneath the search blocks.
Scroll down to the stations beginning with the letter P and click on Pamplona
A new window will open with:
Lista de Destinos Desde el Origen Solicitado PAMPLONA , usted puede viajar directamente a:
Then scroll down to the letter S and click on Sarria
The window will open to the timetable:
Origen: PAMPLONA
Destino: SARRIA
Trenes para el día: Martes 07 Agosto 2012
Tren / Recorrido Salida Llegada Duración Precios Prestaciones Accesible
99648 ENLACE 13.17 21.05 7 h. 48 min. Consultar y comprar
If you click on the train (99648) it will see that is the train from Barcelona to A Coruna.
The trip between Pamplona and Sarria requires a change over at Montforte de Limos.
I caught this train in 2009 after walking the Aragones to Pamplona. We change at Montforte to go to Lugo. The next day we travelled to el Ferrol to start the Camino Ingles.
You can also get a train from Sarria to Pamplona as well:
Trayecto 1º: MD 12644 SARRIA MONFORTE DE LEMOS 09.26 09.54
Trayecto 2º: ALVIA 00625 MONFORTE DE LEMOS PAMPLONA 10.07 17.08