Bei'an–Heihe railway
Route
Table:
Distance	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

Taking into account the table named "Route" section of Bei'an–Heihe railway, give a short sentence answer to: What happened over the course of construction of the Bei'an–Heihe railway? Provide just your answer in a JSON object {"answer": "YOUR ANSWER"}.

answer: 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.