The tabernacle of the congregation - More literally, the tent of meeting. This is the first occurrence of this designation of the tabernacle, and the idea connected with it is that of Yahweh meeting with either Moses, or the priests, or (in a few cases) with the people gathered into a congregation at the entrance of the tent.
Without the rail, which is before the testimony - i. e. the holy place (see Exodus 25:16).