encyclopedia

DIAGNOSTIC TEST EQUIPMENT

Pre-programmed automatic-test sets used to check car circuitry and subsystems. Usually for use in shops, but may refer to portable sets on cars or trains.

DIAL-A-RIDE TRANSPORTATION SYSTEM (DAR)

A demand-responsive system in which curb-to-curb transportation is provided to patrons who request service by telephone, either on an ad-hoc or subscription basis. It is also known as dial-a-bus (DAB) when buses are the vehicles used. (TRB)

DIALBACK

Used as a control over dialup telecommunications lines. The telecommunications link established through dialup on the computer from a remote location is interrupted so the computer can dial back to the caller. The link is permitted only if the caller…

DIESEL RAIL CAR

A self-powered rail car that usually has two diesel engines and can usually operate in multiple units (diesel multiple-unit car). (TRB)

DIESEL-ELECTRIC LOCOMOTIVE

In a common railroad language, refers to the diesel electric locomotive which uses a diesel engine to power an electric generator (or Alternator) and the electric current in turn is used to turn the traction motors connected to the locomotive’s…

DIESEL-HYDRAULIC LOCOMOTIVE

A locomotive in which power from one or more diesel engines is delivered through hydraulic transmission to the driving axles by means of shafts and gears. The hydraulics are for speed control. (TRB)

DIFFERENTIAL FARE

1. A method of travel pricing that varies fares according to the time of day, direction, distance, or other characteristic of the ride on pertinent circumstances. 2. An additional charge for a trip, based on the time of day, direction,…