No room for a siding?

[Chris333]

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https://www.google.com/maps/@43.4844145,-75.3316176,3a,16.3y,333.38h,86.17t/data=!3m6!1e1!3m4!1sPHvyW63kNEyXbrYT9TiUEQ!2e0!7i13312!8i6656

[nkalanaga]

They had a siding going into the building, through what is now a door too small for a freight car, so they buried it and built a new siding on top of it?

[Chris333]

Looks like it was always like that.
https://www.lasermodeling3.com/blog/designing-craftsman-kit-boonville-mill

[nkalanaga]

OK, that picture looks more like a footbridge, or maybe a push-cart railroad, than a standard gauge spur.  That would make sense.  The Google picture makes it look like there's still part of a railroad spur under the current track.