| Subject | English | Chinese |
| space | coding circuit | 编码电路 |
| railw. | coding of continuous track circuit | 轨道电路电码化 |
| tech. | coding of continuous track circuit | 轨道电路电码化 |
| commun., railw. | coding of track circuit | 轨道电路电码化 |
| railw. | coding of track circuits | 轨道电路电码化 |
| commun., railw. | track circuit coding in station | 站内电码化 |
