hi, just seen your question - a pal of mine runs a hornby pendolino and very well it looks. without measuring it (!) I would say you would need 4 feet of platform at least but best bet is to put a tape to it as you will need to provide for the running in distance. i use either peco or hornby double straights where i can (for straight platforms you cannot go wrong with these) but if you are on the bend then peco flexi......but try and connect them to setrack to give it a firm base.