Weight

Exercise

4

40. D. (par. 2.8a)

Ordinarily a group of cars is not broken. This block

ends with car 10030; therefore the cut is made between

cars 10030 and 10035.

4

41. C. (par. 2.8a)

There are only 8 different groups; therefore only 8

tracks are needed.

4

42. D. (figs. 2.1, 2.3)

Because the 1 CP and 2 OW cars (Nos. 26, 27, and 28)

are together and all go to the same track, only one

cut is required here; therefore 25 cuts are necessary

to switch the entire train.

4

43. C. (fig. 2.3)

Since the BO, WD, and LY cars all go on one track, and

all the OW and CP cars all go on another, only 9

different groupings remain.

Therefore 11 tracks are

required for the entire train.

LESSON 3

2

1. A, true. (par. 3.3b(3))

2

2. B, false. (par. 3.5)

2

3. A, true. (par. 3.7)

2

4. A, true. (par. 3.5c)

2

5. A, true. (par. 3.5c)

2

6. B, false. (par. 3.7a)

2

7. A, true. (par. 3.5c)

2

8. A, true. (par. 3.5d)

2

9. B, false. (par. 3.5b)

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