The Batong Line of the Beijing Subway (Chinese: 八通线; pinyin: bātōng xiàn) is a surface level rapid transit rail line in eastern Beijing. It extends Line 1 further east from Sihui to the suburbs in Tongzhou District. The Batong Line derives its name by combining the first character of Bawangfen (八王坟), another place name for Sihui, and Tongzhou (通州) the eastern suburban district of Beijing which the line serves. The Batong Line is sometimes abbreviated as 8T but it should not be confused with Line 8 of the Beijing Subway.
The Batong Line is entirely above ground and runs 18.9 km from the Sihui Station in the west to Tuqiao in the east. Transfers are available to Line 1 at the Sihui and Sihui East stations. The colour of Batong Line that is shown on maps, like that of Line 1, is red.
Flat fare of RMB(¥) 2.00 with unlimited transfers. The first east-bound train departs Sihui at 6:00am. The first west-bound train departs Tuqiao at 5:20am. The last east-bound train leaves Sihui 10:45pm. The last west-bound train leaves Tuqiao at 10:05pm. For the official timetable, see .