Going to the Bible, Two Feet to Tidewater, the only timetable in the book that has the location of Alna Center (Centre, actually), has it at MP 6.4. This is well after "Alna" as a stop disappeared. Narrow Gauge in the Sheepscot Valley vol 6 has time tables, but none have mile posts for Alna Centre or Alna.
The location of Alna Center was established by the fact that the original building had been bought by local boy Austin Trask and dragged off the ROW to use as a hunting camp. When we arrived years later, the building was a pile of rubble where it had been dragged to - but there was enough there to recover some boards. So that's where we put it.
Later I walked the track with the measuring wheel and measured the distance between the two. Before I did that our time tables marked Sheepscot as 4.80 and AC as 6.40, or exactly 1.6 miles apart. After I did that I discovered the two stations were actually 1.57 miles apart, so it meant that one or both of the stations was not exactly where we thought it was. I found Harry's W&Q milepost measurements, which were completely different from ours. By either subtracting or adding (I forget which) exactly 1/2 mile, I made the numbers come out right. So now, Sheepscot is MP 4.83 and AC is MP 6.40.
If you think about it, Alna as a stop has been gone for over 100 years. I tend to think there was no building there. If there was, maybe the crews took it down and disturbed the earth for the TOM siding enough that evidence is long gone.
