My Grandfather had a business on Sussex street in Dover for about 50 years and of course when I used to spend time at the store when I was a kid I noticed all the RR activity going on. My question is this : what was the small concrete building a couple hundred feet east of the frieght house and west of the station and Dover tower. It was in between the main and the spur that went behind the frieght house. it had windows facing the main and was always manned. What was this ? What year did they stop using the frieght house for lcl. or any frieght for that matter ?