Answer: railroads

AnswerCrossword Clue
RAILROADSThey're built to scale
RAILROADSEls
RAILROADSMonopoly quartet
RAILROADSMonopoly foursome
RAILROADS"Monopoly" purchases
RAILROADSFour Monopoly properties
RAILROADSSome Monopoly purchases
RAILROADSSante Fe and Amtrak
RAILROADSUnion Pacific and BNSF
railroadsA system of such tracks with the trains, organization, and personnel required for its working
railroadsA set of tracks for other vehicles
railroadsRAILROAD, to transport by locomotive
railroadsA track or set of tracks made of steel rails along which passenger and freight trains run