Live close by. I work in Cambridge too.

As Wayne say's, from the A1307 follow it in to the city center....you will come to traffic lights and addenbrokes hospital on your left, go straight over the round about, follow it all the way down (Now on Hills Road) you will come to more traffic lights (Shell and pug garage on your right) go straight on and you will come to more lights, again straight on (at this point the train station should be sign posted) im not 100% cos only been to the train station once but I think it is the next right, but best to ask someone around that area as your right close

HTH