encyclopedia

CLASSIFICATION YARD

Used for sorting cars into tracks according to destination, route or train.

CLEAN AIR ACT

The original Clean Air Act was passed in 1963, but the national air population control program is acually based on the 1970 version of the law. The 1990 Clean Air Act Amendments (CAAA) are the most far-reaching revisions of the…

CLEAN AIR ACT AMENDMENTS OF 1990

The comprehensive federal legislation which establishes criteria for attaining and maintaining the federal standards for allowable concentrations and exposure limits for various air pollutants; the act also provides emission standards for specific vehicles and fuels. Also see State Implementation Plan…

CLEAN FUELS

Lower polluting replacements for conventional diesel fuel. The state has mandated that all buses purchased after January 1, 1992 be clean-fueled.

CLEARANCE CARD

A card, when properly completed, authorizes the train operator to operate a train with bypass switches activated, past an interlocking signal displaying a “STOP” indication or activities authorized by the rules.

CLEARANCE LIGHTS

The small red or amber lights located on the upper corners of the body of the bus.

CLIMATE CHANGE

A shift in global weather patterns resulting in an increase in the variablility of temperature, precipitation, and wind in a region over a period of time. Recent studies suggest that emission from gasoline-powered internal comubstion engins have contributed to global…

CLOSED-LOOP BRAKING

Braking under continuous direction of the train control system. (NTSC)