As you are looking for the Railway Recruitment Board Exam Syllabus for Exam of all posts, here I am providing same for you .

1. General Awareness :
Current Affairs (National and International Importance)
Books and Authors
Awards and Honours
Science - Inventions and Discoveries
Abbreviations
Important Days
International and National Organisations
Major Financial/Economic News
Budget and Five Year Plans
Who is Who
Sports

2. Arithmetic Ability : This part of exam is usually checks the quantitative and mathematical skills of the candidates and following is the topics from which the questions asked:
Ratio and Proportions
Unitary Method
Percentage
Time and Distance
Time and Work
Profit and Loss
Number System
HCF, LCM
Simplification
Decimal Fractions
Average
Simple and Compound Interest
Mensuration (2D and 3D)
Algebra
Data Interpretation

3. Technical Ability - This is generally the questions that includes the knowledge of the students about the profession and some technical questions which may be tricky.

Mechanical: Machining and Machine tool operations, IC Engines, Diesel Engines, metal Casting, Metrology and Inspection, Thermodynamics, Theory of Machines, Engineering Mechanics, Machine Tool operations, Fluid Mechanics, heat transfer

Electrical: Circuits & Measurements systems, Electrical machines, power systems, Control Systems, Electrical and electronic measurements, electric circuits and fields, Signals and systems,analog & digital electronics and all other basics of electrical field.

4. Test of Reasoning/Mental

VERBAL
Number Series
Arithmetical Reasoning
Problem on Age Calculation
Blood Relations
Analogy
Decision Making etc.
Alphabet Series
Test of Direction Sense
Coding-Decoding
Number Ranking

NON-VERBAL
Non Verbal Series
Mirror Images
Grouping Identical Figures
Embedded Figures etc
Cubes and Dice

5. General Intelligence
questions pertaining to the fallowing topics :

1. Airthmetic

2. General Awareness

3. General Intelligence & Reasonig

4. General Science