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)
4
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