________ and ‘C’ class ODC shall not be crossed in the block section on double line. A. 50 B. 40 C. 60 D. 75

The correct answer is C. 60.

A ‘C’ class ODC is a train with a maximum axle load of 60 tonnes. According to the Indian Railway rules, two ‘C’ class ODCs shall not be crossed in the block section on double line. This is to ensure the safety of the trains and the track.

Option A is incorrect because 50 tonnes is the maximum axle load for a ‘B’ class ODC. Option B is incorrect because 40 tonnes is the maximum axle load for a ‘D’ class ODC. Option D is incorrect because 75 tonnes is the maximum axle load for a ‘B’ class ODC.