At least in North America, planes and trains have a long history together. In the early years of aviation, both people and mail could cross the country in both, on the same trip. Fly by day, take the train overnight, then catch another plane for the next hop.
And, of course, a lot of airports have, and had in the past, rail service, both for passengers and for air freight.
The Tri-Cities Airport, in Pasco, was a US Navy air training center during WW II. After the war, several of the hangers and warehouses were taken over by various companies, who had rail/road service to one end, and air service at the other. Very handy, and I imagine that happened at a lot of fields around the world.