"I shall have a play tonight on the 747-400 and see if it is possible to have it that way but I'm fairly certain it can't even be done (not that you would want to- you have a very effective white TRK line). "
There is no pilot selection for this feature. It is, however, selectable through a combination of wiring (pin programming) and software changes on aircraft like the 747-400. Some simulators which are used by a number of airlines may allow this selection with a push of a button (not found in a normal aircraft).
Our 747-400 and 767 fleet has "TRACK UP" for whatever reason (perhaps because we are generally a long haul airline where most of the time we are following an LNAV track). Most airlines, I believe have a HDG UP display. KLM, I seem to remember, switched from one to the other.
Regards.
Q.