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INTRODUCTION.

THE Contents of this Field-book are divided mainly into four parts :

Part I. Dealing with Railroad Location.
Part II. Dealing with Railroad Construction.
Part III. Dealing with Reconnoissance and Exploratory

Surveys.
Part IV. Giving various General Information.

To these are added a Short Appendix and a Set of Tables, comprising those generally required for Field use.

Although Part III should, from its nature, take precedence over Parts I and II, since Reconnoissance is usually the first step towards Location, yet the subject of Exploratory Surveying is here treated too fully-in comparison with Parts I and II—to warrant its being regarded merely as an Introduction to them. I have therefore considered it a special subject, and accordingly given to it a subsequent position.

CONTENTS.

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GENERAL CONSIDERATIONS.

SEC.

PAGE

1. Conditions of Economical Location.....

2. Train Resistances............

Rolling Resistance....................

Resistance due to Oscillation and Concussion.............

Atmospheric Resistance.........

Resistance due to Curvature. ............................

Resistance due to Gravity .......

8. Diagram of Resistance...............

Limiting Velocity on any Grade............

9. Propelling Force of Locomotive. ....

Coefficient of Adhesion....

Sliding Friction .........

Limiting I.H.P........

Weight on Driving-wheels....

Grate-surface............

10. Diagram of Propelling Force.........

Limiting Speed for any given I.H.P........

Internal Frictional Resistances............

11

- Back-pressure, Wire-drawing,

... 11

11. Diameters of Driving-wheels .......

.. 11

12. I.H.P. required at any given speed.............

Most Economical Speed ........................................

Limiting Grade......

13. Weight of Locomotives and Rolling-stock.....................

14. Resistance due to Inertia.........

.......................

Rotative Energy of the Wheels.............

15. Resistance caused by Application of Brakes...........

Automatic Brakes ...

15

Hand Brakes............

15

16. Initial Velocity............

15

17. Height corresponding to Velocity....

Table of Heights corresponding to Velocity..........

18. Assumption of Mean Resistance and Mean Propelling Force....

19. Graphic Method of solving Dynamical Problems.................

20. Examples..................... ............................

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COST OF OPERATING.

35. Cost of Work done against Resistance ..

36. Cost per Train-mile...........................................

37. Economy of Construction ...........

38. Cost of Operating Pusher-grades ............

39. To test Relative Cost of Various Routes.. .................
40. Effect of Alterations in Alignment.....
41. To estimate Effect of Ditto......

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