I would propose, if you want to use altitude as a definition:
bottom: the end station with the lower altitude
up: the end station with the higher altitude
mid: any station, not being a base or a head station, irrespective
of the altitude
Or, alternatively one that does not compete with the ele tag and carry a
destination meaning (my preference):
base: the 'valley' station, usually with the lower altitude
head: the 'mountain' or 'top' station, usually with the higher altitude
mid: any station, not being a base or a head station.
aewrialway:station has my preference
Yves
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