How would having more railroad tracks be advantageous during a war?

In WWII the German were smart for strategies they had various railroads that`s  how they would move all they heavy equipment like the panzer divisions. If it was through ground they would immediately get bombed by air raids. so having many railroads systems is a smart and advantage way to transport all type of equipment. If one railroad is down you have like 10 more available and trains can take weapons on board as well like anti aircraft guns and even deadly weapons. plus trains can be strong and fast for these jobs trusting to get their on time with out getting spotted.    

Step-by-step explanation:

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk