The train's engine may be outdated, worn out, or not powerful enough to handle the steep incline of the mountain. Additionally, the tracks may be in poor condition, causing more resistance and requiring extra effort from the train. The train may also be carrying a heavy load, making it difficult to climb the mountain.
the reason of the figurative language
The phrase "tired old train" is a form of figurative language, specifically a metaphor. In this metaphor, the train is compared to a person who is old and worn out, struggling to complete a difficult task. This adds depth and emotion to the description of the train, highlighting its fatigue and the challenge it is facing in climbing the mountain.
