Many comments have been received as a result of the Federal
Railroad Administration's (FRA) issuance of a Proposed Rule for the
Use of Locomotive Horns at Highway-Rail Grade Crossings1. This rule
contains numerous provisions, two of which are addressed in this
study. The first provision addressed in this study states that the
sound level generated by the horn, when measured at the side of the
locomotive, shall not exceed the sound level measured in front of
the locomotive. In the late 1980's it became the de facto standard
to install horns on the top/center portion of the locomotive. This
was done in an attempt to reduce the noise exposure for the
locomotive cab occupants. However, due to propagation effects at
the measurement locations, the result was that measured sound
levels off to the side of the locomotive were often higher than
levels in front of the locomotive. The FRA proposed this provision
to prevent the excessive distribution of sound to the side, which
adds to community noise exposure. This provision could force
railroad operators to relocate most center-installed horns. A large
number of negative comments were received on this provision,
suggesting that this relocation would be unacceptable for the
locomotive crew.
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