The lead of a crossing represents the distance measured from the_________________?
Show answer Hide answer
Answer: B. heel of the switch to the theoretical nose of the crossing
Explanation
The lead of a crossing is defined as the distance from the heel of the switch assembly to the theoretical nose. Measuring this span ensures accurate placement of all turnout components within the track network. Theoretical nose locations provide a stable geometric reference point for track survey crews. Turnout geometry coordinates switches and crossings into a unified track diversion system. Constructing switches requires precise alignment between the switch heel and the crossing frog. Standard railway engineering manuals define lead distances for all standard gauge and frog numbers.
Civil engineering technicians stake out turnout leads to guide manual track laying operations. Correct lead dimensions ensure that wheelsets transition smoothly between main and diverging tracks. Railway maintenance teams verify lead measurements during routine track geometry audits. Option A describes the switch length distance rather than the overall crossing lead. Option C measures starting from the switch toe instead of the switch heel position. Option D utilizes the actual blunted nose point instead of the theoretical geometric intersection.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. The maximum physical dimension of a standard rail section corresponds to its________________?
Show answer Hide answer
Answer: A. height
The overall vertical height of a standard rail section represents its largest physical cross sectional dimension. Rail profiles are designed with significant vertical height to resist heavy bending moments under loads. C...
Q2. An inclined red band at a 45° angle on a shunting signal conveys the indication_________________?
Show answer Hide answer
Answer: B. proceed
Shunting signal color bands and positions convey specific movement instructions, such as proceeding under caution or permission. An inclined red band displayed at a 45 degree angle on a shunting semaphore signal explicit...
Q3. The lead of a crossing is measured as the distance starting from the__________________?
Show answer Hide answer
Answer: B. heel of the switch to the theoretical nose of the crossing
The lead of a crossing is measured horizontally from the heel of the switch to the theoretical nose. Theoretical nose represents the geometric intersection point of the gauge lines of the crossing. This standardized meas...
Q4. For a Broad Gauge wooden sleeper measuring 275x25x13 cm spaced at 75 cm intervals, the minimum depth of the ballast cushion is________________?
Show answer Hide answer
Answer: C. 25 cm
For broad gauge tracks with wooden sleepers, the minimum ballast cushion depth is twenty five centimeters. Ballast depth distributes heavy axle loads safely onto the compacted subgrade formation below. Adequate cushion d...
Q5. The minimum composite sleeper index mandated by Indian Railways for a track sleeper is_______________?
Show answer Hide answer
Answer: B. 783
Indian Railways mandates a minimum Composite Sleeper Index of 783 for acceptable wooden track sleepers. The Composite Sleeper Index serves as a quantitative measure of a timber species' mechanical strength and durability...
Q6. The total number of switches incorporated in a gauntleted track configuration is_______________?
Show answer Hide answer
Answer: D. none of the above
A gauntleted track interleaves two parallel tracks without incorporating any switches or crossings. Zero switches are required because the running rails are simply interlaced within the same gauge space. Gauntleted track...