A railway electrification system supplies electric power to railway trains and trams without an on-board prime mover or local fuel supply. Electrification has many advantages but requires significant capital expenditure. Selection of an electrification system is based on economics of energy supply, maintenance, and capital cost compared to the revenue obtained for freight and passenger traffic. Different systems are used for urban and intercity areas; some electric locomotives can switch to different supply voltages to allow flexibility in operation. 

Electric railways use electric locomotives to haul passengers or freight in separate cars or electric multiple units, passenger cars with their own motors. Electricity is typically generated in large and relatively efficient generating stations, transmitted to the railway network and distributed to the trains. Some electric railways have their own dedicated generating stations and transmission lines but most purchase power from an electric utility. The railway usually provides its own distribution lines, switches and transformers. QUESTIONS:

Q1:
1. How do railway trains and trams get electric power?
2. What gives railway trains and trams the electricity that powers them?
3. 
Q2:
1. What is absent from railway electrification systems?
2. What do railway electrification systems not have?
3. 
Q3:
1. What hauls passengers?
2. What kind of train contains passengers?
3. 
Q4:
1. Do passenger cars share motors?
2. Is there one motor for multiple passenger cars?
3. 
Q5:
1. What is the source of power for electric railways?
2. What sends power to electric railways?
3. 
Q6:
1. Do some electric railways have their own generating stations?
2. Are there sometimes dedicated generating stations for an electric railway?
3. 
Q7:
1. How do most electric railways get power?
2. What is the most common way for an electric railway to generate power?
3. 
Q8:
1. What comparison does the article make with capital amount?
2. What is capital amount looked at next to?
3. 
Q9:
1. Is an identical generating system used for urban and intercity?
2. Do urban and intercity electrify in the same way?
3. 
Q10:
1. How can flexibility exist in operations?
2. What allows for some wiggle room in railway electrification systems?
3. 
Q11:
1. What do railway electrification systems provide?
2. What is supplied by railway electrification systems?
3. 
