It is a direct service to Milano Centrale.
It will stop at Napoli Afrogola, Roma Centrale and Milano Rogoredo only (as well as Milano Centrale). It will not stop at Firenze and Bologna.
Depending about your final destination you may consider to get off at Milano Rogoredo (but there is the chance that you have todo some stairs there. It is a long time since I have been there and I am not sure if there are lifts at all the platforms)
It runs everyday except on holiday and the day before. (which means it does not run on Saturday, Sunday, on bank holiday and the day before)
If you go to viaggiatreno you can see the real time status and position of the train
www.viaggiatreno.it
If you click on
Train - Station
Then if you insert "Napoli centrale" you get real time departure and arrival boards
If you insert 9636 (the reporting number of your train) you get real time information for your train (including planned and real(*) platform)
I suppose, English is not my first language, that actual platform would be a better translation
And "Orientation: Executive in the head" the coach with Executive class (the most expensive of the 4 options) is at the front part of the train.
Your train will reverse in Roma Termini, but not in Florence (it does not go to Firenze Santa Maria Novella, but it goes straight using a chord)
If you click on the name of the stops you can see the connecting trains at that stop.
I do not think you can find a map like the one on Traksy. It is already difficult to find a static official map (made by Trenitalia or RFI or Ferrovie dello Stato)
To get very detailed information about the railway line (including map) you can have a look at
Fascicoli circolazione Linee (FCL) and and Fascicoli di Linee (FL)
This is probably too much detailed, but I can not find anything else straightaway
For the part in Lombardy you can look at FCL 021 and FL 32
(FCL 021 is a generic document for all the sector near Milan, and FL 32 is specific to the rail line between Milano and Tortona)
To get them go to
On the right press "Milano (21-40)"
the on the new page press the Adobe acrobat symbol or the download symbol corresponding to the FCL 021 and the FL 32