Which advance made a network of railroad lines possible? a. the air brake c. the convertible berth b. a standard gauge d. the dining car Which advance made a network of railroad lines possible? a. the

asked Jan 28, 2021 48.9k views

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2 votes

Answer:

Explanation: because I just did the quiz and got it right

Auron answered Jan 29, 2021

by Auron

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4 votes

Answer:

A standard Gauge

Step-by-step explanation:

I think thats right

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