On the train to Canterbury

We are (we hope) on the train to Canterbury. Two people have asked us where the train is going, AND THEY ARE ON IT!

We took a bus to Victoria Station, and the station master told us to get on the train on track #6. We jumped on, and it left.

Now it appears that we have to move to a different car, as they divide the train at Faversham, and we are on the wrong side.