Railway Engineering4th Year General

October 2011

Section(1)Steam Locomotive

Course Frame

• Chapter 1 Motive power

• Chapter 2 Train Resistance

• Chapter 3 Railway Track 2 sections

• Chapter 4 Alignment 1 sections

• Chapter 5 Turnouts 1 sections

Course Marks

• Final Exam ……..70 marks

• Term work………30 marks

4 Sections

Midterm

9 Assignments

8 attendance

Reports

Chapter 1Motive power

Steam locomotive

Main parts of steam locomotive

• Firebox and boiler

• Super heater

• Engine

• wheels

Firebox and boiler

Function of boiler“it is used for heating water converts it into steam at certain pressure”.

Function of firebox“it is used for burning the coal to get the needed heat”.

Function of tubes or flues“it is used for conducting heat horizontally through boiler”.Number = 140:375Diameter = 1.75:4 inchesLength= 11:21 feet

Super heater

Definition of super heaterit is number of u-tubes used for: Increase pressure of steam makes it close to

gaseous state . Prevent pressure of steam inside engine cylinder. Increase tractive effort of locomotive.

Degree of superheating“It is the amount of difference between temperature of superheated steam and temperature of saturated steam under same pressure” .

Engine

Wheels

Types of wheels according to manufacturing material1. Rolled steel wheels2. Forged steel wheels3. Cast steel wheels4. Built up wheels5. Chilled iron wheels

Wheel slope trickIt is aslope 1:20 at surface of wheel to keep train movement at the cl. of track and protect track from side shocks

Trucks

Journal bearing and Spring riggingJournal :’’ it is the extended part of out side the axis which receive the load of the car or locomotive and then transfer these loads to the rail ‘’

Brass bearing Roller bearing

High starting resistanceNeed much attentionHigh maintenance cost Short ageHigh noise

low starting resistanceDon’t need much attentionLow maintenance cost long ageLow noise

Function of spring rigging

1. Absorb shocks caused due to sudden stop of the train and during the train movement to protect the track and locomotive

2. Distribute load of locomotive equally on supporting bearing points

3. Make locomotive more stable and steady

Types of wheels in steam locomotive

• Driving wheels• Truck wheels

Driving Wheels Truck Wheels

• Bigger diameter than truck ones• Moving the train

• Smaller diameter than driving• Carry excessive loads of locomotive• Make balance for the locomotive

Steam locomotive classification

Rear wheels C Driving wheels B front wheels A

Steam locomotive type = A – B – C = 4 – 16 - 4

Questions ?