This comment is based on the post Laws of Physics.
The third track option through Ashland cannot work, regardless of whether it is at grade or below grade. Here is why.
- The first track was laid down before the Civil War. Homes and businesses were built around it at a sensible spacing. We can see that sensible spacing when we look at old pictures of Ashland, such as the one at the head of this post.
- At a later date — the first decade of the 20th century, I believe — they decided to install a second track. There wasn’t enough room for it but they shoehorned it in anyway. This explains why so many visitors to Ashland comment on the closeness of the tracks to the homes. The reason that they seem too close is that is that they are too close. However, we have learned to live with the situation, just as someone can get used to a shoe that is too tight.
- But trying to add yet another track is absurd. It doesn’t matter if it is built at grade or below grade. There is no room for it. This is not an opinion — it is merely a statement of the laws of physics. If it installed at grade, some buildings, many of which are of enormous historical importance, will have to be removed to provide sufficient space for the tracks. If the track is installed below grade then many buildings will have to be demolished. In addition, some buildings (including some constructed more recently) will fail because their foundations simply do not have the integrity to handle the appalling vibrations that the digging of the trench would create. Either way the result is the same: the loss of Ashland.