Answer :
Final answer:
Rule 193 refers to railway operations, specifically main tracks and yard limits. These are operational spaces on railways managed by specific rule sets, usually marked by signs. The included information about city blocks seems unrelated.
Explanation:
The student's question refers to Rule 193, a regulation within railway operations. In this context, the 'main tracks' represent the primary railway routes that trains travel along. 'Yard limits' are portions of these main tracks defined by railroad authorities where certain operational rules apply, often relating to train speeds and how trains can be operated within the yard. These limits are usually marked by special instruction signs.
As for the figures and the specific mention of 120m blocks, this information appears to be unconnected to the rest of your question, possibly indicating a mistake in the inclusion of this data. Therefore, no elaboration is provided regarding these components, as they seem to pertain to city planning or geography, not Rule 193 or railway operations.
Learn more about Rule 193 here:
https://brainly.com/question/32904333
#SPJ11
