What are common risks associated with poor roadbed drainage?

Poor roadbed drainage can lead to several issues that negatively impact the safety and efficiency of rail operations. One major risk of inadequate drainage is the obstruction of visibility. When water accumulates on or around the tracks, it can create obstructions or even lead to growth of vegetation, which might obscure signals or signage crucial for train operation.

Additionally, stagnant water or muddy conditions can reduce the visibility for train operators, particularly during low-light conditions or inclement weather. This becomes critical as operators rely on clear sightlines to make informed decisions about train speeds and stops, thereby increasing the risk of accidents.

In contrast, other options mentioned do not reflect typical consequences of poor drainage. Increased train speeds would be unsafe under these conditions, while improved roadbed strength and enhanced air circulation are not outcomes one would associate with insufficient drainage, as they do not directly address the implications of standing water on the rail infrastructure.