The operation of more than ______ electric locomotives, except MU cars in a train consist is prohibited:

• A. 1
• B. 2
• C. 3
• D. 4

Answer: (B)

The limit being tested is the maximum number of electric locomotives allowed in a single train consist (with MU cars not counted). You can have up to two electric locomotives, and any operation with more than two is not allowed. Keeping the count to two helps ensure straightforward control, reliable traction and braking coordination, and manageable locomotive-to-locomotive power distribution. If more locomotives were added, the control and braking systems would become more complex, increasing the risk of miscoordination and safety issues. MU cars are excluded from this count, so they don’t affect the allowed number of locomotives.