I don't know what the original use for this structure was, but now, nothing. The tracks are used by the Naugatuck RR, the tourist line run by the Railway Museum of New England (RMNE).
The "Privy" @ Chama, NM Outhouse for log bunkhouse. The last of many that were on the property before indoor plumbing.
Tower 3, moved from diamond to down town location in Flatonia, Texas. Tower 115 in Eagle Lake before it was demolished Tower 17 in Rosenberg while still active.
Here's one from downtown FtWorth at the TRE station. Notice the tracks go under the building. Pretty cool.