What was a result of creating rail standardization? railways were able to transport meat without spoilage. trains provided cars with pull-down beds for overnight travel. trains from different rail lines could use each other’s tracks. rail companies began to create their own styles of rails and tracks.

American railroads were created to serve regions limited to the municipalities and their contours. Thus, the technical aspects were chosen in each state according to the preference of the engineers.

As the country's development progressed, markets expanded and locomotives had to move beyond their limits. Thus, a standard was agreed and all tracks were standardized.

Thus, trains of different railway lines could use the lanes of each other, according to item C of the question.

c is a symbol. when bernice gets her hair cut, it is the authors way of showing the affects and demands of pier pressure and the over-all attitudes of people at the time.

given the fact that the question is about the detail that best support the idea that oppressive leaders use   propaganda to achieve thir goals,   the first option does not refer to any kind of propaganda, since it only tells about that the milk and the windfall apple should be reserved for the pigs. in the second option, that is, "snowball and napoleon sent out flights of pigeons whose instructions were to mingle with the animals on the neighbouring farms, tell them the story of the rebellion, and teach them the tune of "beasts of england". it can be identified that the oppressors make use of the propaganda, which is represented by the pigeons, and the information they have to tell other animals about what was happening in the farm in order to get their objectives. for that reason, the right answer is the second option, taking into account that the third option do not refer to propaganda since it only talks about that they did not want jones back. and, finally, the last option refers to the result of the given news, but it does not mean about the propaganda they used to achieve their goals.