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Bridge & Trestle Handbook by Paul Mallery soft cover Revised edition 1976 Red Co
Bridge & Trestle Handbook by Paul Mallery
Soft cover. Revised edition 1976
136 pages. Indexed
The complete guide to selection, design, & construction of model railroad bridges .
Contents
1 PURPOSE OF BRIDGES AND TRESTLES
2 ELEMENTARY BRIDGE ENGINEERING
Basic Terms, Stresses, Loadings
3 TYPES OF BRIDGES
4 SELECTION OF BRIDGE TYPE
Span, Era, Terrain, Traffic
5 CULVERTS
Pipe, Box, Arch, Modeling
6 ABUTMENTS, PIERS, AND PEDESTALS
Stone, Concrete, Steel, Timber, Modeling
7 BRIDGE FLOORS
Open, Ballasted, Highway, Minimum Clearance, Modeling
8 BEAM BRIDGES
Timber, Steel, Concrete, Modeling
9 PLATE-GIRDER BRIDGES
Deck, Through, Railroad, Highway, Modeling
10 STEEL TRUSS BRIDGES
Truss Types, Deck, Through, Modeling
11 TIMBER BRIDGES
Arch, Truss, Covered, Railroad, Highway, Modeling
12 ARCH BRIDGES
Nomenclature, Stone, Concrete, Steel, Modeling
13 MOVABLE BRIDGES
Turntable, Swing, Bascule, Vertical Lift, Transfer Table, Rolling, Floating, Transporter, Transfer Bridge
14 LONG-SPAN BRIDGES
Cantilever, Continuous, Suspension
IS TRESTLES
Timber, Steel, Concrete, Modeling
16 BRIDGE MISCELLANY
Refuge, Mirrors, Telltales, Signs, Catenary,
A Comedy of Errors
Appendix 1
STRUCTURAL SHAPES
Appendix 2
NMRA STANDARD CLEARANCES
Appendix 3
CONVERSION TABLES
Prototype Inches to Decimal Inches
Prototype Feet to Decimal Inches
Wire Gage to Scale Inches
Inches to Meters
Feet to Meters
TOPICAL INDEX
Introduction
Bridges and trestles are among the most logical and most challenging structures for railway modeling. They form part of the immediate right of way and they furnish reason for the changes in track elevation and terrain which make a railroad interesting and different in appearance.
The challenge comes from the fact that a bridge or trestle is not a standard piece of equipment like a locomotive or car, and yet each bridge offers as much opportunity for detail workmanship as the finest Lima Berkshire, plus the necessity of intelligently free-lancing a design to fit the particular situation.
The fundamental rule might be stated: The scale model bridge should follow, in miniature, a design which would be sound engineering for a full-size structure of similar span and loading. The entire design of a bridge changes with its length, and a span which would be adequate for a single-track light-traffic branch will not do for a heavy main line location.
Thus the model railroad designer and builder is faced with unique problems if his bridges are to be realistic. The right type of bridge must be chosen for each location, answering the question, "If I were running a full-size railroad what would be the best bridge for this spot?" If a plate girder, the girder must be of correct depth in proportion to length and load. If a truss, it must be correct in form and detail. The abutments must be strong enough to hold their share of the load.
All this sounds like more engineering than the average model rail might be expected to tackle. And there lies the real challenge and the satisfaction that can conic with a difficult job well done. A bridge, after all, stands still subject to the minute examination of a visiting fireman. It cannot take refuge in motion as can a poorly detailed locomotive. Even the most blase superintendent of model ways and structures must take pride when a noticing friend says, "Wonderful! I see you've got the necessary extra piling under the ends of that girder span in your trestle."
Now, for the first time in book form, the background of railway bridge design is made available to model rails in a form that is readily usable. The intricacies of correct planning arc yours between these covers - and along with them the satisfaction of knowing that your bridges and trestles are as realistic as your locomotives, cars, interlocking towers, and your track.
Author Paul Mallery has again accomplished what seems impossible. In his previous book, "Electrical Handbook for Model Railroaders," he nude electricity intelligible to the man without electrical background. Now he makes it easy for the man without an engineering degree to design his model bridges and trestles so he may be proud of them even if a bridge engineer comes to call.
PURPOSE OF BRIDGES AND TRESTLES
GENERAL
A bridge may be modeled for its own sake as a display piece or for a model contest separate and apart from any model railroad layout. For such a model accuracy of detail and excellent workmanship are of great importance but no consideration of the use of the bridge need be given. Most bridge models, however, are built for installation on a lay out and, as such, are part of the scenery. If a good effect is to be achieved, the bridge model should not only be an accurate representation of the type selected, but also the type itself should be appropriate to the location and railroad. Thus a model bridge should have its design based on apparent age, type of traffic over the bridge, and its location.
As always. when seeking to achieve realism in modeling, it is best to look first at the prototype. There is found a vast array of bridges hut they fall into categories depending upon their age, the load they carry, and their reason for being built. This chapter covers the purposes of bridges as a guide to an appropriate type. Chapter 3 covers the effect of loading and age upon the proper selection of the bridge to be modeled.
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