The correct answer is: 15.
A block section is a section of railway track that
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The correct answer is: 15.
A block section is a section of railway track that
11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTubeOption A: 20 is incorrect because it is more than the maximum number of track machines that can be sent for working in a block section.
Option B: 15 is the correct answer because it is the maximum number of track machines that can be sent for working in a block section.
Option C: 25 is incorrect because it is more than the maximum number of track machines that can be sent for working in a block section.
Option D: 30 is incorrect because it is more than the maximum number of track machines that can be sent for working in a block section.