<pedant>4 stationsDidcot Railway Centre must be a contender as they have 3 stations within a site that is only about 3 quarters mile long.
They have a mainline and branchline, with the branchline running into the Broad Gauge Transfer Shed, right next to the mainline "Oxford Road" station.</pedant>
In all seriousness, it makes it more impressive that they have squeezed so much into a small site! And it doesn't feel crowded either. I could go on about Didcot all day but I won't in order to keep the thread on topic and to not bore others