Not Jackson. (I thought there was a station there, but I could be wrong.)
Good stab, Valvegear! Leeor
is the right answer.
Leeor, between Lillimur and Serviceton, apparently opened with the line in 1887 as a staff-and-ticket station. It probably had a common or garden veriety three-road layout. A 14-lever interlocking frame was installed in 1889. By 1891 it was closed as a staff-and-ticket station, and by the early years of the 20th century it appeared to have lost its interlocking frame, signals, points, sidings, pretty much everything apart from the platform. It closed altogether in 1909.
So what was the point of opening it at all, so close to both Lillimur and Servie? Legal reasons, apparently. There was a border dispute between Victoria and South Australia, and the latter colony (as it was then) took legal action. Had the verdict been in S.A.'s favour, the border would have been east, not west, of Serviceton; and as this was before Federation, farmers railing produce from Serviceton to Melbourne would have had it subject to Customs examination. So Leeor was seemingly built to solve a problem which, as the litigation was decided in Victoria's favour, ultimately never arose. Hence the removal of facilities as quickly as they were installed.
As for the cryptic comment that the station moved 27-odd miles closer to Melbourne, this is no doubt explained by the opening of the line between Bacchus Marsh and Ballan on the 4th December 1889. So grade books prior to that date showed Leeor at 310 rail miles from Melbourne (doubtless via Geelong), and grade books after that date 283 1/2 miles doubtless via the more direct route.
The present day Leeor Loop is in approximately the same area, but I'm not sure it's in exactly the same area - I think it could be half a mile or so on the down side.
Over to you, Valvegear.