How does an English speaking couple get tickets and access the train from St Petersburg to Helsinki.
It looks like you can buy these on the Finnish rail website. Details here: https://www.seat61.com/helsinki-to-st-petersburg-by-train.htm
Harold beat me to it , but in addition to the ticket purchase , there is one other thing to bear in mind - I took this train , " Allegro " in Autumn of 2015 , so it is possible things have since changed , but if not - You will need to board the train at Finlandsky Station . You will arrive by either metro or perhaps taxi . The train does not depart from the station building proper , but from a platform which you access on the west side of the building , about a block north . Find it by standing in front of the station , facing the building . Turn left and walk to the corner and turn right , up that street . The entrance is a block or so on your right . These pictures and map will illustrate the layout https://firstname.lastname@example.org,30.3560303,3a,75y,115.54h,92.67t/data=!3m6!1e1!3m4!1s7dUUbOQMoZuhF4vbK8hpAQ!2e0!7i13312!8i6656 the station - https://www.google.com/maps/place/Finlyandskiy+Railway+Stationemail@example.com,30.3559532,19z/data=!4m5!3m4!1s0x46963179791d548d:0xf22eb2f52f8dc738!8m2!3d59.9556921!4d30.3565697 Map showing the Allegro entrance - https://www.google.com/maps/place/Finlyandskiy+Railway+Stationfirstname.lastname@example.org,30.3560317,18z/data=!4m5!3m4!1s0x4696317bd1e7f78f:0xe9f02b4466d960cf!8m2!3d59.9569434!4d30.355692 The picture is the entrance