The British Rail Class NUMBER@1 was an electric locomotive used on the ORGANIZATION@1 , unlike most other LOCATION@1 electric locomotives -LRB- such as the class NUMBER@2 & NUMBER@3 -RRB- they could not operate away from the electrified -LRB- NUMBER@4 V DC third rail -RRB- system .

Unlike most other LOCATION@1 electric locomotives -LRB- such as the class NUMBER@2 & NUMBER@3 -RRB- they could not operate away from the electrified -LRB- NUMBER@4 V DC third rail -RRB- system .
