Dobar It uses sub-divided panels and curved top chords for through trusses and curved bottom chords for deck trusses. The increased depth also leads to reduced deflections, i. Sheet vuide walls are fairly expensive and require extensive information on buried utilities prior to driving. Concrete piles are also used satisfactorily for trestle bents and sheet piling. Prior to this time, the live loads used in bridge design were subject to the judgment of the engineer and tended to vary to the extent that it was difficult to relate the relative strength of one structure to the next.
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Specific maintenance activities along with the function of major production gang activities are discussed. The role of safety and safety enforcement is also addressed here.
Chapter 4 — Right-of-Way and Roadway Chapter 4 seeks to explain how right of way is defined and utilized. This chapter includes typical dimensions, property rights, limitations, utility easements, fencing, and vegetation.
Also addressed are issues concerning; basic soil types, geotechnical behavior of various types of soils, typical track structure and the loading it imposes on the subgrade, roadbed failure landslides and track settlement causes and remediation, and ways to identify potential hazards to the roadbed and take appropriate action to mitigate those hazards. Chapter 5 — Drainage Chapter 5 stresses the importance of drainage in maintaining quality track.
The primary hydrology and hydraulic principles are reviewed along with a demonstration of the use of commonly available resources. Consideration is provided to the impact poor drainage design can have on railway neighbors as well as the integrity of the railway itself. Chapter 6 — Railway Track Design Chapter 6 provides information pertaining to the different design elements of railway alignments, layout and design.
Specific topics include horizontal and vertical alignment design, turnout geometry, location, and use; railway clearances and vehicular envelope requirements; typical yard and terminal functions and layouts. Additional considerations pertaining specifically to design elements of railway alignments and limitations are discussed as they relate to proposed use i. Chapter 7 — Communications and Signals Chapter 7 is intended as a basic overview of railway signaling.
The chapter provides an appreciation of the historical development of railway signal systems as well as an understanding of basic signal terminology. Basic types of signals, available energy sources, lightning and surge protection and basic track circuits including: DC track circuits, Coded DC track circuits, Style C track circuits, Overlay track circuits and AC track circuits are addressed here.
An understanding of track switches, components and their interconnection to the signal system is provided. Crossing warning device theory of operation and differences between conventional and solid state devices is highlighted. The basic principles of CTC, sequence of operation and safety checks are explained along with concepts associated with microprocessor based coded track circuits and solid-state interlockings.
Finally, a description of the common types of defect detectors in use is provided. Chapter 8 — Railway Structures Chapter 8 was prepared to accomplish two primary objectives. For the novice engineer, the authors wished to provide an overview of the types of railway bridge structures and their appropriate usage as well as define the primary bridge components and their functions. Further, drainage structures, retaining walls, tunnels and sheds are classified by type as well as by common use.
For the experienced highway design engineer, the common design approach differences between highway and railway bridges are reviewed. Other critical structure criteria are highlighted such as fatigue, fracture critical members, structure serviceability, bearings and volumetric changes and composite design. Chapter 9 — Railway Electrification Chapter 9 compares the various alternatives available when considering and designing an electrified railway.
A general overview of the key components and their primary function is provided for 3 rd rail systems and overhead catenary systems OCS. Fundamental criteria for selection of style of OCS are discussed along with other design basics. Finally, the impact that implementation of electrification will have on existing railroad infrastructure, staff and community is discussed.
Chapter 10 — Passenger, Transit and High-Speed Rail Chapter10 presents an overview of typical design principles, construction practices and maintenance considerations applied to passenger rail lines.
It describes how basic railroad engineering principles are applied in specialized ways to accommodate passenger rail requirements. The chapter notes the key distinctions between railroad and transit operations and introduces six major types of passenger rail modes.
The text then discusses the service, infrastructure, regulatory U. It concludes with discussion of the special topics of line capacity and cant deficiency. Chapter 11 - Environmental Regulations And Permitting Chapter 11 is a general overview of environmental regulations and permitting in the U.
This information is general in nature and the reader is cautioned to contact or use a professional environmental consultant to prepare an Environmental Assessment. Information is given on wetland issues along with other topics, such as endangered species, cultural resources, Phase I environmental assessments, hazardous waste, brownfields, asbestos and air quality.
Environmental information includes: the U. Army Corps of Engineers wetland definition, Nationwide and General permits for proposed construction activities, U.
Army Corps of Engineers non-jurisdictional status over isolated wetlands and Best Management Practices which mitigate direct and indirect degradation of the environment to the extent possible. Each topic concludes on where to locate additional information. The reader will obtain an understanding of the geometrical and mathematical relationships common to both North American and European track geometry.
The potential for incorporating European practices in high-speed North American transit initiatives is clearly obvious. Chapter 13 — Case Studies Chapter 13 presents four case studies drawn from actual railway design projects using formatted templates to identify critical stakeholders, identify controlling criteria, recognize potential problems, and learn from past mistakes.
It is intended that this will be part of an accessible library of case study solutions yet to be developed.
Appendix The Appendix contains a wide variety of useful and related information to the material presented in the text. Glossary The glossary contains short definitions of the majority of the terms utilized within the text.
Railway engineering terminology common to the industry is often not self- explanatory. It is essential that the engineer have a clear understanding of the terms in use.
Practical Guide Table of Contents
Practical Guide to Railway Engineering
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