Originally Posted by
MSPeconomist
I think the OP wants to board the train in Bonn rather than Koln for the trip TO FRA.
However, I wonder why the ticket wasn't purchased from Bonn. Even when LH ran its own airport express train between FRA and DUS, it stopped in Bonn.
Indeed. Bonn is my destination, and the origin of my return. I guess I simply wasn't engaging my brain sufficiently when purchasing to consider whether it would make a difference.