user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Route' regarding 'Bei'an–Heihe railway'
Table Content:
| Distance | Distance | Station name | Station name | Station name | - |
| --- | --- | --- | --- | --- | --- |
| Total; km | S2S; km | Current name | Former name | Year opened | Connections |
| 0 | 0 | Bei'an 北安 | - | 1933 | Binbei Railway, Qibei Railway |
| 16 | 16 | Erjing 二井 | - | 1934 | - |
| 35 | 19 | Erlongshantun 二龙山屯 | - | 1934 | - |
| 52 | 17 | Wudalianchi 五大连池 | - | 1934 | - |
| 63 | 11 | Longzhen 龙镇 | - | 1934 | - |
| 71.3 | 7.8 | Jusheng 聚盛 | - | 1934 | - |
| 81 | 18 | Xianghe 襄河 | - | 1934 | - |
| - | - | Longmenhe 龙门河 | - | 1934 | - |
| 136.8 | - | Chenqing 辰清 | - | 1934 | - |
| - | - | Qingxi 清溪 | - | 1935 | - |
| 187 | - | Sunwu 孙吴 | - | 1935 | - |
| - | - | North Sunwu 孙吴 | - | 1935 | - |
| - | - | Eyu 额雨 | - | 1935 | - |
| 234 | - | Chaoshui 潮水 | - | 1935 | - |
| 257 | 23 | Xigangzi 西岗子 | - | 1935 | - |
| - | - | Sanjitun 三吉屯 | - | 1935 | - |
| 287 | - | Jinhe 锦河 | - | 1935 | - |
| 302.9 | - | Heihe 黑河 | - | 1935 | - |


Question
What happened over the course of construction of the Bei'an–Heihe railway?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["Work on the new line, began at Bei'an, terminus in 1933, and the section, 136.8 km (85.0 mi) from Bei'an to Chenqing, was opened in 1934."]