encyclopedia

DOUBLE-DECK CAR

A bilevel rail car with a second level that covers the full width of the car but may or may not extend the full length. (TRB)

DOUBLE-DECKER BUS

A high-capacity bus that has two levels of seating, one over the other, connected by one or two stairways. Total bus height is usually 13-14 ft (4-4.4 m), and typical passenger seating capacity ranges from 40 to 80 people. (TRB)

DOUBLE-ENDED TRANSIT UNIT (BIDIRECTIONAL TRANSIT UNIT)

A rail car or train with an operating cab at each end.

DOUBLE-SIDED LINEAR INDUCTION MOTOR (DLM, DSLM)

A linear induction motor that has its active primary winding constructed so that it reacts magnetically with both sides of the guideway-mounted reaction rail (secondary winding). (TRB)

DOUBLESTACK

A train of containers, often stacked two high, on well cars. Also see Container.