CEE410 - Part 3

Question 1

Automatic Train Stop

Answer 1

A system whose operation will automatically result in the application of the brakes until the train has been brought to a stop

Question 2

Automatic Train Control

Answer 2

– A system whose operation will automatically result in the following:
• A full service application of the brakes which will continue either until the train is brought to a stop or its speed is reduced by the engineman to a predetermined rate
• Will apply the brakes when operating under a speed restriction, if the speed of the train exceeds the predetermined speed, until the speed is reduced to that speed

Question 3

Cab signal

Answer 3

– A signal located in engine control compartment indicating a condition affecting the movement of train or engine
– Used in conjunction with interlocking signals and in conjunction with or in place of block signals

Question 4

William Robinsons basic track circuit

Answer 4

Uses rails to detect the presence or absence of a train

Only binary data (limitation)

Question 5

Line circuits

Answer 5

Used for signals with multiple indications (3+?)

Needs a lot of poles and wires

Expensive

Inefficient

Question 6

How do coded track circuits work?

Answer 6

Coded impulses are transmitted by rails to code detectors, who translate it into signal aspect and gives new code to the next block

No code: Restricting

75: Approach
120: Approach medium
180: Clear

Question 7

Benefits of coded Track circuits

Answer 7

Now expensive wires needed

Improved:
Shunting sensitivity
Broken rail detection
Immunity to foreign currents

Longer block length possible

Aspects can be read by locomotive for continuous displayed signal inside

Question 8

Coded track circuits enable:

Answer 8

Approach locking for interlocking plants

Cab signaling, automatic train stop, automatic train control

Centralized traffic control

Not illuminating lights until train is approaching

Question 9

Problems related to trip stops

Answer 9

Need double block overlap to ensure safety

Hard to maintain in seasonal temperature changes
- no use for main lines

Question 10

Intermittent ATS

Answer 10

Transmits control functions from wayside to the train only at discrete points along the track

Only binary

Question 11

What did the 5 fingers say to the face?

Answer 11

SLAP!!!!!!