Why were railroads called iron horses?

a. Railroads looked like horsesb. railroads were as fast as horsesc. this was the most familiar mode of transportationd. railroads were as uncomfortab

a. Railroads looked like horses
b. railroads were as fast as horses
c. this was the most familiar mode of transportation
d. railroads were as uncomfortable as horses

or:a. Railroads looked like horsesb. railroads were as fast as horsesc. this was the most familiar mode of transportationd. railroads were as uncomfortable as horses

or:b. railroads were as fast as horsesThat and they had more endurance than horses, by going all day non stope.

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