Template talk:Infobox rail service/doc

This template has the parameters "start" and "end", but it seems to me that it would be more correct to have parameters for termini, such as "western terminus" and "eastern terminus". "Start" and "end" suggest that the train always starts at the "start" and ends at the "end" and does not operate in the reverse direction. Is it therefore possible to add "terminus" parameters to this infobox?