I love it when work and hobby intersect - I can test my software while exploring the WW&F!
Anyhow, on page 85 of Two Feet to Tidewater, a 1903 Time Table is Reproduced. Note that the locations of Alna Center (or Alna, or Alna Centre) are not included in most timetables. The 1903 table shows Alna Centre at MP 6.4. This conflicts directly with the
1930s table, showing it at MP 7.0.
However, MP 6.4 would be consistent with the other calculations for Sheepscot and Head Tide - short by about +/-.4 miles.
I propose that when Frank Winter's 1930s timetable was produced, he either:
1. Guessed where Alna Center was, because he wanted to fill in the blank left from other timetables.
2. Accidentally used the location of the discontinued ALNA station - which is where we now call Top of the Mountain.
3. Just made a plain old mistake.
To investigate argument #1, look at the 1899 timetable on page 64 in Two Feet to Tidewater. No MP locations are given for: Alna Centre, Prebles, Maxcys, Newells, Coles, and So. Albion. On the 1930s timetable, these are listed at 7.0, 15.7, 23.0, 31.0, [not listed], 40.0 respectively. It is interesting that Alna Center, Maxcy's, Newells, and So. Albion ALL have nice round numbers for their mileposts.
However, I did some quick measurements with my software, and the other distances work out to be:
Albion to So. Albion: 3.4 Miles (shown as 3.5 miles in the 1930's timetable.)
Palermo to Newells: 2.4 Miles (shown as 1.9 miles in the 1930's timetable.)
Newells to Weeks Mills: 2.4 Miles (shown as 2.8 miles in the 1930's timetable.)
Windsor to Maxcy's: 1.4 Miles (shown as 1.0 mile in the 1930's timetable.)
Maxcy's to Cooper's Mills: 2.2 Miles (shown as 3.2 miles in the 1930's timetable.)
N. Whitefield to Prebles: 1.5 Miles (shown as 1.7 miles in the 1930's timetable.)
Prebles to Whitefield: 2.5 Miles (shown as 2.4 miles in the 1930's timetable.)
Head Tide to Alna Center: 2.5 Miles (shown as 2.1 miles in the 1930's timetable.)
Alna Center to Sheepscot: 1.5 Miles (shown as 2.2 miles in the 1930's timetable.)
Note the wide discrepancies for the locations of Newells, Maxcy's, and Alna Center. These all had ".0" mile posts on the 1930s timetable. HOWEVER, if you consult the 1903 timetable, the locations for Prebles, Newells, Maxcy's, and Alna Center all align with the 1930s timetable (with nice round numbers.) So that kills theory #1.
So, I strongly suspect that the MP 7 location of Alna Center in the 1930s Frank Winter's timetable is simply an error. Perhaps it is based on the location of the discontinued Alna station at TOM; I think it is more likely just a typo. Later, Linwood Moody used this timetable for his documentation. Thus, the "correct" location of Alna Center is MP 6.4.