Exercise 33. Change italicised words into their synonyms from the vocabulary. To (put) rails on granite blocks, to (ensure) drainage, a greater (steadiness) of the track, the (intensive) traffic, to (abolish) rail joints, (to substitute for) iron rails, a (trunk) line, to be (rightly) called; (both switches and) rails, to (back up) the idea; the (peculiarities) of modern track; to know (exactly); the (simplicity) of calculation.

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