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This is a sprue of head lamps for OO / HO Scale trains. Based on those seen on the Thomas & Friends TV series, which were based off of lamps seen on Marklin Engines. Alternatively, you can buy a tail lamp as well, or else a combo of the two lamps - just see my store for all my items. This lamp has a hole in the bottom of it so that it will fit over the lamp irons on Bachmann HO Thomas models, but these can be extended to fit larger lamp irons or else ignored if you don't have any lamp irons to fit. These look best with a dab of hot glue for a bulb on the front as seen in the photo.
To remove them from the sprue just pull them off or snip the sprue off.
Until next time, I wish you dry rails, smooth running, and happy shopping!