Patent ID: 8176854

Claim:
A roof structure for a power module of a locomotive, the roof structure comprising: an upper roof layer including a substantially flat lower surface, at least a portion of the upper roof layer including a first set of cooling passages; a lower roof layer including a substantially flat lower surface and being at least partially positioned below the upper roof layer, at least a portion of the lower roof layer including at least one drain passage, and at least a portion of the lower roof layer including a second set of cooling passages, wherein each of the cooling passages of the first set of cooling passages does not overlap a cooling passage of the second set of cooling passages; and at least one gutter disposed along the lower roof layer, the at least one gutter configured to receive environmental elements flowing through the at least one drain passage; wherein the cooling passages of the first set include a first cooling passage, a second cooling passage, and a third cooling passage, the first cooling passage being aligned with the second cooling passage along a first direction and aligned with the third cooling passage along a second direction that is generally orthogonal to the first direction, each of the first, second, and third cooling passages including a raised lip; a first portion of the upper roof layer extends along an entire distance separating the raised lips of the first and second cooling passages; a second portion of the upper roof layer extends along an entire distance separating the raised lips of the first and third cooling passages; and the first portion and the second portion of the upper roof layer are substantially flat and substantially coplanar.