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| 71. | renewal of track |
| 线路更新 |
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| 72. | line out of service |
| 线路停用 |
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| 73. | line termination unit |
| 线路终端设备 |
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| 74. | wayside radio statio |
| 线路无线电台 |
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| 75. | line transmission |
| 线路传输 |
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| 76. | regular vehicle |
| 线路车 |
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| 77. | line transmitter |
| 线路发报机 |
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| 78. | balanced circuit |
| 平衡线路 |
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| 79. | interruption on track |
| 线路中断 |
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| 80. | spare channel |
| 备用线路 |
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