Summary

Samuel Nelson Minnesota Company v. St. Paul Company…

One machine is so light, or its motion so violent, that it must be steadied by some fastening to the floor; the next is heavy enough to keep in place by its own weight. Now there is no reason in saying that one machine will, and the other will not, pass with the freehold. Both are essential to the same business, one is useless without the other, and both are in the mind of the purchaser when he buys the establishment. It seems absurd to say that, to be sure of getting all the machinery, he must nail it down to the floor, when perhaps fifty men could not start it a hair.
Source: Wikisource

Samuel Nelson Minnesota Company v. St. Paul Company…

The right to buy and own rolling stock is a franchise, and can only be exercised as an accessory to the operation of a railroad. Any buying or selling of cars, engines, &c., by the company, for the mere purpose of speculation, would be unauthorized and illegal. Here, then, is a consideration showing that a company intends the rolling stock to be used only for the road, or, in other words, to become a permanent accession to the real estate of the company.
Source: Wikisource

Samuel Nelson Minnesota Company v. St. Paul Company…

An article was held to be a fixture or not, from the presence or absence of a screw fastening it to the floor.
By the great majority of cases, ancient and modern, there is no doubt that a fastening was essential to constitute the thing in question a part of the freehold; and nothing kept in place by mere gravitation was held to be a fixture. It is not less true that from the first we have the doctrine of constructive annexation equally well established.
Source: Wikisource

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