分析了我国铁路客运的现状，回顾了国产客运内燃机车的历史，提出建设客运专线和优化客货共运线的设想，并将共运线按违反分为四个层次，相应地提出了机车的型语；讨论了主要干线客运速度及内燃机车的选型；提出了采用柴油机装车功率为4910马力、驱动装置用滚动轴承轴悬式的机车作为干线客运机车的建议。 This paper analyzes the current situation of China’s railway passenger transport, reviews the history of domestic passenger diesel locomotives, proposes the idea of ​​building passenger dedicated lines and optimizing passenger and freight transport routes, and divides the common transport routes into four levels according to the violation, The main trunk passenger transport speed and the selection of diesel locomotive are discussed. The suggestion of using locomotive with 4910 horsepower diesel engine and rolling bearing axle suspension as the trunk passenger locomotive is put forward.