NSB El 7 was a series electric locomotives delivered between 1911 and 1918 to Norsk Transport that operated the Rjukan Line and the Tinnoset Line, where they were designated RjB.1, 2, 3, 6, 7 and 8.

The locomotives were built by AEG (motor) and Skabo (chassis).

[1] The first three locomotives were delivered to the Rjukan Line along with two smaller units, RjB 4 and 5 (which were given the designation El 6 by NSB).

1 and 3) were transferred to Norwegian State Railways in 1920 after NSB took over the Tinnoset Line, where they were designated El 7 and numbered 2501 and 2502.

It returned to Drammen in 1936 and remained there until it was taken out of service in 1956; RjB 6 was retired in 1960, the rest remained in service with Norsk Transport in 1966 when they were replaced with NSB El 1 (given numbers 14 and 15).