When a stream engine is running tender foremost the speed shall not exceed ________. A. 40 kmph B. 20 kmph C. 30 kmph D. None of these

The correct answer is: B. 20 kmph.

When a steam engine is running tender foremost, the speed shall not exceed 20 kmph. This is because the tender is the part of the engine that carries the fuel and water, and when it is in front, it creates a lot of drag. This drag can cause the engine to overheat and could potentially lead to a fire.

Option A is incorrect because it is the maximum speed that a steam engine can travel when it is running normally. Option C is incorrect because it is the maximum speed that a steam engine can travel when it is running tender foremost on a level track. Option D is incorrect because it is not a valid option.