The correct answer is: D. None of these
The speed of a goods train with a crane attached is not limited to 50 kmph, 40 kmph, or 25 kmph. The speed of the train will depend on the type of crane, the weight of the load, and the condition of the track.
A crane is a machine that is used to lift and move heavy objects. There are many different types of cranes, including tower cranes, mobile cranes, and crawler cranes. The type of crane that is used will depend on the size and weight of the load that needs to be lifted.
The weight of the load that is being lifted by a crane will also affect the speed of the train. The heavier the load, the slower the train will need to go. This is because the crane needs to be able to lift the load without causing the train to derail.
The condition of the track will also affect the speed of the train. If the track is in good condition, the train will be able to go faster. However, if the track is in poor condition, the train will need to go slower to avoid derailing.
Therefore, the speed of a goods train with a crane attached is not limited to 50 kmph, 40 kmph, or 25 kmph. The speed of the train will depend on the type of crane, the weight of the load, and the condition of the track.