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 Used to prevent train collisions
 Collisions are a major concern as trains travel
on fixed paths
 A freight train trav...
 Early signals were flags
or lamps placed at a
predetermined
stopping distance from
an obstacle
 Used before stations
an...
 Began in the 1830s
 Balls of different
colors and shapes
were raised and
lowered to show
“Safety” or
“Danger”
 Began in the
1840s
 Several designs
 Different shapes
or colors
described
specific
situations
 Tracks divided into sections known as “blocks”
 Used to space trains far enough apart so they
could not collide
 Signa...
 Often used to tell an
engineer they need to stop
and receive a telegraph
 Common in 1870s
 Downside was colors were
no...
 Allowed automatic signal
operation from long distances
 Created closed-circuit tracks
by using the rails as
conductors
...
 Previous signals hard to distinguish from long
distances and only able to be seen during day
 Position signals
introduc...
 Electrical currents in
tracks determines if
block is occupied
 Block lengths may be
variable and computer-
generated
 ...
•Salary: $51,000 - $61,000
•Education: Bachelor’s
•Experience: 0-2 years
Civil Engineer
•Salary: $56,000 - $65,000
•Educat...
 Designs and supervises construction projects
such as airports, bridges, channels, dams,
railroads and roads
 Responsibi...
•Salary: $51,000 - $61,000
•Education: Bachelor’s
•Experience: 0-2 years
Civil Engineer
•Salary: $56,000 - $65,000
•Educat...
 Designs, tests, installs and maintains large-
scale electronic equipment or machinery for
use in manufacturing or power ...
•Salary: $51,000 - $61,000
•Education: Bachelor’s
•Experience: 0-2 years
Civil Engineer
•Salary: $56,000 - $65,000
•Educat...
 Prepares and inspects projects involving
drilling and exploration
 Responsible for geological mapping, report
writing, ...
•Salary: $51,000 - $61,000
•Education: Bachelor’s
•Experience: 0-2 years
Civil Engineer
•Salary: $56,000 - $65,000
•Educat...
 Joins, fabricates and repairs metal and other
weldable material by applying appropriate
welding techniques
 Interprets ...
•Salary: $51,000 - $61,000
•Education: Bachelor’s
•Experience: 0-2 years
Civil Engineer
•Salary: $56,000 - $65,000
•Educat...
 Assembles fabricated parts to relatively large
or heavy subassemblies and complete units
 Tests and calibrates parts an...
 Characteristics of electrical circuits
 have a closed loop
 have a full, circular path
 Today’s activity is to build ...
 The green screw on the
light switch is a ground,
do not use this screw
 Don’t attach both wires
to the same end of the
...
Railroad Signals
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Railroad Signals

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"Railroad Signals" is a PowerPoint for primary and secondary students. This presentation provides a history of train and railroad signaling, as well as highlights careers in the rail industry and transportation fields. Additionally, this lesson can be paired with an "Electrical Circuits" activity.

Published in: Education, Technology, Business
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Railroad Signals

  1. 1.  Used to prevent train collisions  Collisions are a major concern as trains travel on fixed paths  A freight train travelling at 55 mph takes over a mile to stop  A train will not be able to stop before hitting an object after the engineer sees it
  2. 2.  Early signals were flags or lamps placed at a predetermined stopping distance from an obstacle  Used before stations and draw bridges  Only other control system was by timetables
  3. 3.  Began in the 1830s  Balls of different colors and shapes were raised and lowered to show “Safety” or “Danger”
  4. 4.  Began in the 1840s  Several designs  Different shapes or colors described specific situations
  5. 5.  Tracks divided into sections known as “blocks”  Used to space trains far enough apart so they could not collide  Signalmen were stationed at the beginning of each block and changed the signal  Signalmen sent telegraphs to confirm when trains passed  Widely used after 1850
  6. 6.  Often used to tell an engineer they need to stop and receive a telegraph  Common in 1870s  Downside was colors were not standardized  Originally white used instead of green as green was difficult to produce
  7. 7.  Allowed automatic signal operation from long distances  Created closed-circuit tracks by using the rails as conductors  Original idea in 1872, but at the time was not able to power a signal
  8. 8.  Previous signals hard to distinguish from long distances and only able to be seen during day  Position signals introduced in 1920s  Red, yellow and green lights added in 1950s
  9. 9.  Electrical currents in tracks determines if block is occupied  Block lengths may be variable and computer- generated  Signal is green if next two blocks are unoccupied  Yellow if second is occupied  Red if next is occupied
  10. 10. •Salary: $51,000 - $61,000 •Education: Bachelor’s •Experience: 0-2 years Civil Engineer •Salary: $56,000 - $65,000 •Education: Bachelor’s •Experience: 0-2 years Electrical Engineer •Salary: $50,000 - $57,000 •Education: Bachelor’s •Experience: 4 years Geotechnical Engineer •Salary: $30,000 - $39,000 •Education: High School Diploma/G.E.D. •Experience: 0-2 years Welder •Salary: $26,000 - $34,000 •Education: High School Diploma/G.E.D. •Experience: 0-2 years Heavy Assembler
  11. 11.  Designs and supervises construction projects such as airports, bridges, channels, dams, railroads and roads  Responsibilities also include estimating costs and personnel and material needs, preparing proposals and establishing completion dates
  12. 12. •Salary: $51,000 - $61,000 •Education: Bachelor’s •Experience: 0-2 years Civil Engineer •Salary: $56,000 - $65,000 •Education: Bachelor’s •Experience: 0-2 years Electrical Engineer •Salary: $50,000 - $57,000 •Education: Bachelor’s •Experience: 4 years Geotechnical Engineer •Salary: $30,000 - $39,000 •Education: High School Diploma/G.E.D. •Experience: 0-2 years Welder •Salary: $26,000 - $34,000 •Education: High School Diploma/G.E.D. •Experience: 0-2 years Heavy Assembler
  13. 13.  Designs, tests, installs and maintains large- scale electronic equipment or machinery for use in manufacturing or power generation or transmission  May use computer-assisted engineering and design software and equipment to perform assignments
  14. 14. •Salary: $51,000 - $61,000 •Education: Bachelor’s •Experience: 0-2 years Civil Engineer •Salary: $56,000 - $65,000 •Education: Bachelor’s •Experience: 0-2 years Electrical Engineer •Salary: $50,000 - $57,000 •Education: Bachelor’s •Experience: 4 years Geotechnical Engineer •Salary: $30,000 - $39,000 •Education: High School Diploma/G.E.D. •Experience: 0-2 years Welder •Salary: $26,000 - $34,000 •Education: High School Diploma/G.E.D. •Experience: 0-2 years Heavy Assembler
  15. 15.  Prepares and inspects projects involving drilling and exploration  Responsible for geological mapping, report writing, site characterization, numerical modeling and analysis of excavations/supports
  16. 16. •Salary: $51,000 - $61,000 •Education: Bachelor’s •Experience: 0-2 years Civil Engineer •Salary: $56,000 - $65,000 •Education: Bachelor’s •Experience: 0-2 years Electrical Engineer •Salary: $50,000 - $57,000 •Education: Bachelor’s •Experience: 4 years Geotechnical Engineer •Salary: $30,000 - $39,000 •Education: High School Diploma/G.E.D. •Experience: 0-2 years Welder •Salary: $26,000 - $34,000 •Education: High School Diploma/G.E.D. •Experience: 0-2 years Heavy Assembler
  17. 17.  Joins, fabricates and repairs metal and other weldable material by applying appropriate welding techniques  Interprets blueprints, specifications, diagrams or schematics to determine appropriate welding process  Inspects completed welds to determine structural soundness
  18. 18. •Salary: $51,000 - $61,000 •Education: Bachelor’s •Experience: 0-2 years Civil Engineer •Salary: $56,000 - $65,000 •Education: Bachelor’s •Experience: 0-2 years Electrical Engineer •Salary: $50,000 - $57,000 •Education: Bachelor’s •Experience: 4 years Geotechnical Engineer •Salary: $30,000 - $39,000 •Education: High School Diploma/G.E.D. •Experience: 0-2 years Welder •Salary: $26,000 - $34,000 •Education: High School Diploma/G.E.D. •Experience: 0-2 years Heavy Assembler
  19. 19.  Assembles fabricated parts to relatively large or heavy subassemblies and complete units  Tests and calibrates parts and mechanisms to meet tolerances and product specifications
  20. 20.  Characteristics of electrical circuits  have a closed loop  have a full, circular path  Today’s activity is to build basic circuits with batteries, switches and lights  There are two ways to wire lights:  Series – if one lights go out, both go out  Parallel – possible for one light to work while other does not  One will give you brighter lights than the other
  21. 21.  The green screw on the light switch is a ground, do not use this screw  Don’t attach both wires to the same end of the battery  Turn the switch to off until you are done wiring, it makes it easier to see how bright the lights are

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