Maryland Gov.-elect Larry Hogan (R) announced eight more senior members of his administration Tuesday, including a new transportation secretary whom he introduced as “the best highway builder in the entire country.” Hogan’s nomination of Pete Rahn, who has held top transportation jobs in New Mexico and Missouri, comes amid great uncertainty over the future of the light-rail Purple Line in the Washington suburbs and other proposed mass-transit projects. The governor-elect has strongly signaled that he will emphasize roads over rail after he takes office Jan. 21. Hogan, who made tax cuts a rallying cry of his campaign, also pledged to...