Every weekday on my way to Brooklyn, I pass by a yard area city side of the Jamaica station at which I see, some newish diesels, some ancient grafittied passenger cars, one old Plymouth looking yard switcher and two older diesels numbered 102 and 104, somewhat rusted and dilapidated. I worked late last night and while waiting for a connection at Jamaica, I looked up and saw sitting on track 9, parallel to the station, 102 and 104 coupled and ready to go. I did notice that the fronts of each were coupled, which sort of surprised me. The treat was twofold- First, that I was able to see these units closer up than I had before and while still waiting, I heard a rumble sort of like someone gunning an engine without a muffler and the pair left the station area pdq. I was under the impression these units were yard decorations since I had not seen them moved or moving in 6 years of using the LIRR.