No. 927.

Railroads

RAILROAD COMPANIES, BY CLASS: 1950 TO 1971

[Prior to 1960, excludes Alaska and Hawaii. See text, p. 536, for explanation of class limits]

559

1 Includes class III railroads for 1950 and 1955, and circular railroads through 1960, not shown separately. ? Includes operating, lessor, proprietary, and unofficial companies, and through 1960, circular.

Excludes those in systems which file consolidated reports combining mileage, investment, and other items on a net system basis.

Source: U.S. Interstate Commerce Commission, Statistics of Railways in the United States, annual, and, beginning 1955, Transport Statistics in the United States, Part 1, annual.

No. 928.

RAILROADS

EQUIPMENT IN SERVICE: 1950 TO 1971

[Prior to 1960, excludes Alaska and Hawaii. See also Historical Statistics, Colonial Times to 1957, series Q 53-65]

Source: U.S. Interstate Commerce Commission, Transport Statistics in the United States, Part 1, annual.

No. 929. RAILROADS, CLASS I LINE-HAUL-FUEL AND POWER CONSUMED AND RAILS AND TIES LAID: 1950 TO 1971

[See text, p. 536, for explanation of class limits. See also Historical Statistics, Colonial Times to 1957, series

128-137]

- Represents zero.

New and used rails and ties used in replacement, additional tracks, new lines, and extensions.

Source: U.S. Interstate Commerce Commission, Annual Report and Transport Statistics in the United States, Part 1.

No. 930. RAILROADS-MILES OF ROAD OWNED, by Geographic DIVISION: 1950 TO

1971

[As of December 31. Data are for actual length of line owned by line-haul companies in each State without duplication. For composition of divisions, see fig. I, p. xii]

Source: U.S. Interstate Commerce Commission, Statistics of Railways in the United States, annual, and, beginning 1960, Transport Statistics in the United States, Part 1, annual.

No. 931. RAILROADS, CLASS I-CARS OF REVenue Freight LOADED, 1950 to 1972, AND BY COMMODITY GROUP, 1972

In thousands. Figures are 52-week totals. See text, p. 536, for explanation of class limits. "N.e.c." means not elsewhere classified]

Carloads

25, 172 1,390, 960

1 With highway trailers. * Except furniture.

Source: Association of American Railroads, Washington, D.C., Cars of Revenue Freight Loaded, annual. No. 932. CLASS I RAILROADS AND MOTOR CARRIERS OF PROPERTY, -Revenue FREIGHT ORIGINATED, BY COMMODITY GROUP: 1971

[Carloads and tons in thousands; revenue in millions of dollars. See text, p. 536, for explanation of class limits]

COMMODITY GROUP

Total.....

Source: U.S. Interstate Commerce Commission, Freight Commodity Statistics-Class 1 Railroads in the United States, annual, and Class 1 Motor Carriers, Property Operating in intercity Service, annual.

No. 933. RAILROADS

EMPLOYEES, HOURS, AND COMPENSATION: 1950 TO 1971 [Excludes switching and terminal roads. See also Historical Statistics, Colonial Times to 1957, series Q 141-142]

Source: U.S. Interstate Commerce Commission, Transport Statistics in the United States, Part 1, annual, and Statement No. A-300, annual.

4,992

4, 894

4,793

5, 111

5, 363

5, 557

5,895

2.00

2. 66

3.06

3.54

3.79

4. 04

4. 52

4,719

6, 270

7, 490

8, 654

9,279

9,841

10,836

No. 934. RAILROAD ACCIDENTS-PERSONS KILLED AND INJURED, BY TYPE OF ACCIDENT: 1950 To 1971

Prior to 1960, excludes Alaska and Hawaii. Covers all reportable accidents, i.e., those resulting in personal casualty or in damage to railroad property exceeding amounts specified by Federal Railroad Administration. See also Historical Statistics, Colonial Times to 1957, series Q 143-144]

Source: 1950-1965, U.S. Interstate Commerce Commission, Accident Bulletin, annual; thereafter, U.S. Federal Railroad Administration, Accident Bulletin, annual.

No. 935. HIGhway Grade Crossings-NUMBER AND ACCIDENTS: 1950 to 1971 [Prior to 1960, excludes Alaska and Hawaii. Covers all railroads, except as noted. See also headnote, table 934. See also Historical Statistics, Colonial Times to 1957, series Q 125-127]

? Includes crossings with operated gates or watchmen, or both, during at least part of day; and those with audible or visible signals, or both. Excludes those with fixed signs only.

Excludes nontrain accidents. 4 Excludes motorcycles.

Source: U.8. Interstate Commerce Commission, Accident Bulletin, annual, and Transport Statistics in the United States, Part 1, annual (formerly Statistics of Railways in the United States). Beginning 1968, accident data from U.S. Federal Railroad Administration, Accident Bulletin, annual.

No. 936. PETROLEUM PIPELINE COMPANIES

SUMMARY: 1950 TO 1971

Prior to 1960, excludes Alasks and Hawail. Refers to pipeline companies operating in interstate commerce and subject to jurisdiction of Interstate Commerce Commission. See Historical Statistics, Colonial Times to 1967, series Q 342-344 for miles of line operated and oil originated]

! Includes pipeline taxes: excludes Federal income taxes.

2 Years prior to 1965 based on a different system of sccounts; therefore, comparable data not available. 'After extraordinary and prior period items.

Source: C 8. Interstate Commerce Commission Statisties of Oil Pipeline Companies, annual; and, begin. ning 1955, Transport Statistics in the United States, Part 6, annusì.

Section 22

Transportation-Air and Water

This section presents statistics on civil air transportation, both passenger and cargo, and on water transportation, including inland waterways, oceanborne commerce, the merchant marine, cargo and vessel tonnages, and shipbuilding. The principal sources of these data are the annual FAA Statistical Handbook of Aviation, issued by the Federal Aviation Administration; the annual Waterborne Commerce of the United States and the Annual Report of the Chief of Engineers, Part 2, issued by the Corps of Engineers of the Department of the Army; the monthly and annual U.S. Waterborne Foreign Trade, and U.S. Airborne Foreign Trade, issued by the Bureau of the Census; and the annual Merchant Marine Statistics, issued by the Bureau of Customs. Data on air transportation are also presented in Air Transport Facts and Figures, published annually by the Air Transport Association of America, Washington, D.C. Additional sources of data on water transportation include A Statistical Analysis of the World's Merchant Fleets, issued periodically by the Maritime Administration of the Department of Commerce; The Bulletin, issued monthly by the American Bureau of Shipping, New York; and the Annual Summary of Merchant Ships Launched in the World and the Register Book published by Lloyd's Register of Shipping, London, England. The 1821 through 1946, the 1946-1963, the 1964, and the 1965 issues of Foreign Commerce and Navigation of the United States, published by the Bureau of the Census, are basie sources of historical data. Data relating to merchandise exports and imports are in section 30 of this Abstract, Foreign Commerce and Aid.

Civil aviation.-Federal promotion and regulation of civil aviation are carried out by the Federal Aviation Administration and the Civil Aeronautics Board. The Board issues certificates permitting persons to engage in air transportation as a business, fixes air mail rates which they may charge, and may establish maximum and minimum rates for transportation of passengers and goods. The responsibility for investigation of aviation accidents, formerly held by the Civil Aeronautics Board, resides with the National Transportation Safety Board of the Department of Transportation.

The principal activities of the Federal Aviation Administration are: Controlling the use of navigable airspace; prescribing regulations dealing with the competency of airmen, airworthiness of aircraft, and air traffic control; operation of air route traffic control centers, airport traffic control towers, and flight service stations; the design, construction, maintenance, and inspection of navigation, traffic control, and communications equipment for the airways; and promotion of air safety.

These agencies publish annual operational data on the use of airway facilities; data related to the location of airmen, aircraft, and airports; the activity volume in the field of non-air carrier (general aviation) flying; and aircraft production and registration. Air carriers and service.-The term certificated route air carrier refers to air carriers holding certificates of public convenience and necessity, issued by the Civil Aeronautics Board, authorizing the performance of scheduled air transportation over specified routes and a limited amount of nonscheduled operations. This general carrier grouping includes the so-called passenger/cargo carriers and the all-cargo carriers, and comprises all of the airlines certificated by the board, except the supplemental air carriers. Certificated route air carriers are often referred to as "scheduled airlines," although they also perform nonscheduled service. Nonscheduled service comprises revenue flights that are not operated in regular scheduled service, such as charter flights, and all nonrevenue flights incident to such flights. Scheduled service is transport service operated over an air carrier's certificated routes, based on published flight schedules, including extra sections and related nonrevenue flights.