00391586

Component

http://onlinepubs.trb.org...s/trr/1983/927/927-008.pdf

https://scholar.google.co...uish&publication_year=1983

The Dowty system for the continuous control of freight car speeds in classification yards is based on hydraulic retarders and pneumatic booster-retarder units. Dowty retarders adopt the retard mode only for cars traveling faster than the preset control velocity; the booster-retarder units are adjusted to monitor speed and accelerate or retard as appropriate. Five examples of recent application developments are given: (a) Sentrarand Yard in South Africa, in which both retarders and booster-retarder units provide continuous speed control; (b) Trondheim Yard in Norway, in which the continuous speed-control system has been modified to facilitate clearing snow; (c) Nurnberg Yard in West Germany, in which the retarder system is a combination of existing clasp retarders and a modernized control system; (d) an electrohydraulic latch to hold the retarder capsule in the down position to permit highspeed train withdrawals toward the hump; and (e) use of hydraulic retarders to provide end-of-track arrester zones.

Publication of this paper sponsored by Committee on Rail Freight Classification Terminal Design. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01420434

pp 32-38

1983

Transportation Research Record

Railroad Classification Yard Workshop, 3rd, USA

0309036178

Print

Figures (14) ; Photos (9) ; References (2)

Acceleration (Mechanics); Deceleration; Hump yards; Retarders (Concrete); Snow removal; Speed control

Design; Highways; Planning and Forecasting; Railroads; I21: Planning of Transport Infrastructure

TRIS, TRB

Jan 30 1985 12:00AM

• A COMPUTER FOR YOUR OLD HUMP YARD?
• A MODULAR APPROACH TO CLASSIFICATION YARD CONTROL
• CANADIAN NATIONAL RAILWAYS' TERMINAL INTERACTIVE MODEL (TRIM)
• CLASSIFICATION YARD COMPUTER CONTROL SYSTEMS
• EFFECT OF MEASUREMENT ERRORS ON CAR ROLLABILITY DISTRIBUTION IN A YARD
• EMPIRICAL RESULTS FROM FREIGHT CAR ROLLABILITY STUDY
• ENGINEERING DESIGN AND OPERATIONAL STUDY OF COYOTEPEC YARD
• INNOVATION IN CLASSIFICATION YARD TECHNOLOGY: PROCEEDINGS OF THE THIRD RAILROAD CLASSIFICATION YARD WORKSHOP. INTRODUCTION
• ON THE BEHAVIOR OF LONG CUTS WITH UNEVEN LOAD AND AXLE DISTRIBUTION IN CLASSIFICATION YARDS
• SEMIAUTOMATIC OPERATION FOR UPGRADING INTERMEDIATE-SIZED HUMP YARDS
• THE VR-IV RETARDER CONTROL SYSTEM
• TRIM SIMULATION OF CANADIAN NATIONAL RAILWAYS' THORNTON YARD