I will be in Rome this April and will be travelling Rome-Pisa-Venice-Milan
I have checked the train details and am also interested in knowing whether any buses run between the above cities. Any website or contact numbers that can be provided will be a big help. Am interested in making a comparitve study of trains and buses and then book accordingly. Also it would be great if anyone could let me know whether there will be lesser prices if I book earlier.
While it ís possible to get around by bus, it's absolutely not something I would recommend if there is an alternative railroad connection. While Eurolines (I can't think of other companies that offer service between the cities you mention) may be slightly cheaper, it won't make a big difference; but it wíll take you a lot more time getting from A to B.
thanks so much for the tip! Will the tickets of train be cheaper if I book them early or does it not make any difference if I pick them up when I reach the station in the cities????
Don't prebook; the Trenitalia online booking system is eternally down, and using agents will cost you a lot more than the (very moderate) discount you'd be entitled to.
What is important is to pay attention to train type. See the Italy article: basically, try taking regionali whenever you can (as long as you're not in a hurry). They're about 50% cheaper than Eurostar, which is the trains most tourists take.