Standard size of timber sleeper for Meter Gauge (MG) track: Select the commonly adopted dimensions (Length × Width × Thickness).

Introduction / Context:
Timber sleeper dimensions are standardized to suit gauge, loading, and support requirements. For meter-gauge (MG) routes, sleepers must provide adequate bearing on ballast and proper spacing for fastenings while remaining economical and manageable during maintenance.

Given Data / Assumptions:

• Gauge: Meter Gauge (MG).
• Traditional timber sleeper usage and standard sizes.

Concept / Approach:
Sleeper length mainly relates to gauge and allowance beyond rail seats; width and thickness provide strength and bearing area. MG sleepers are shorter than Broad Gauge (BG) sleepers but must still satisfy stability and fastening spacing criteria. A common standard is around 1.83 m length with section about 20 cm × 11 cm.

Step-by-Step Solution:
Check typical MG sleeper length: approximately 1.83 m.Check section: about 20 cm width and 11 cm thickness provide adequate bearing and strength.Option selected matches established MG practice: 1.83 m × 20 cm × 11 cm.

Verification / Alternative check:
Historic standards and maintenance manuals list this MG sleeper size as a widely used choice for conventional timber-track systems.

Why Other Options Are Wrong:
2.74 m: Typical of BG lengths; too long for MG standard timber sleepers.1.52 m and 1.75 m: Too short, compromising bearing and fastening layout.

Common Pitfalls:

• Assuming BG sizes apply to MG routes.
• Ignoring fastening clearances and ballast bearing area needs.

Final Answer:
1.83 m × 20 cm × 11 cm