Change train ticket at Cadiz, and bus traveling between Cadiz and Seville

Hello fellow cruisers & destination experts:

I am planning to travel from Cadiz to Seville. And I have some questions.

TRAIN TICKET CHANGE

If I pre-purchase train tickets directly from Renfe, and

If I want to do a same day change to an earlier departure from Cadiz,

is it fairly straightforward that I can change the tickets at the Cadiz train station?

FROM SANTA JUSTA TRAIN STATION TO THE REAL ALCAZAR

If you took a taxi, how much was it? Did it take about 15 mins as Google map estimated?

If you took the bus, did you buy the tickets from the bus driver or a ticket machine? If ticket machine, did it accept non-Spain credit card? Also, is there multiple journey tickets that can be shared by different people?

BUS FROM CADIZ TO SEVILLE

I just learned from this forum that there is a bus from Cadiz to Seville. Thank you!

Do you know if the bus company releases the bus schedules for the upcoming week only?

I searched for next week and I could find the bus schedules.

When I searched early October or November, nothing was returned.

Thank you

C

PS:

For those of you who have walked from the cruise terminal to the Cadiz train/bus station, is the Google estimated, about 10 mins, from Plaza Espana?

Bus is Comes, takes 1 hr 45 min http://www.tgcomes.es/horarios_13.htm

Cadiz bus station (bunch of stops) is couple of minutes closer than train station from dock. 10-15 min should do it.

Last week I was in SEVILLA and price for Comes bus was 18€ rt or 14 ow. Actually stop in SEVILLA is PRADO SS (San Sebastian) which is in walking distance to Alcazar, Cathedral and Plaza Espana. Main train station Santa Justa is further away. Also most trains go to San Bernardo station which is closer to center (about 5 blocks from PRADO on same street).

For Alcazar I suggest buying online ticket for 1€ more (reg price is 11.50€ now). Saves tons of time as line up may be up to 1 hr. Cathedral doesn't matter.

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