abolitionism abraham lincoln aeolus railroad car alton railroad american civil war anacostia river baltimore belt line baltimore city council baltimore orioles baltimore and ohio chicago terminal railroad baltimore and ohio railroad martinsburg shops baltimore and ohio railroad locomotives baltimore and philadelphia railroad battle of cool spring battle of fort stevens battle of kernstown ii battle of monocacy battle of moorefield board of directors bollman truss railroad bridge csx transportation capital crescent trail carrollton viaduct catoctin station raid central ohio railroad chain bridge charles carroll of carrollton chessie system cincinnatian cumberland valley dalecarlia tunnel daylight speedliner dividend east coast of the united states erie canal fall line fare granite harpers ferry armory harry gilmor inch inclined plane interstate commerce commission iron john brown johns hopkins jubal anderson early lackawanna lehigh valley leiper railroad lew wallace marietta and cincinnati railroad maryland campaign maryland in the american civil war metropolitan special midwestern united states millimetre monocacy mount royal station narrow gauge railway national historic landmark national limited new york ohio river ohio and mississippi railroad old main line subdivision operating cost oriole park at camden yards patapsco river patterson creek pennsylvania railroad potomac electric power company potomac river potomac yard profit rail gauge reconstruction finance corporation reporting mark romney expedition roundhouse seaboard system railroad standard gauge stonewall jackson sympathy strike thomas viaduct train ferry trestle turner ashby upstate new york virginia washington - chicago express west virginian western maryland railway wikimedia commons wikisource winchester and potomac railroad world war ii