Sanity check on traction motor power

Dear All,

I am trying to run a sanity check on the motor size of the following World War 2 military "turntable" rail system:

• - A level, circular narrow-gauge track, with an outside diameter of 20 meters (65 ft).
  - The track is narrow gauge (80-90 cm; 30-35”).
  - 4 electric locomotives are distributed evenly around the track.
  - A weight of 100 metric tons (221000 lbs) rests on the 4 locos (i.e., the locos share the weight).
  - Each loco has 1 electric motor.
  - Each loco has 2 bogies.
  - Each bogie has 2 axles.
  - Each motor is down-geared and drives at least one axle of one bogie.
  - The diameter of the wheels on the inside rail is about 5% smaller than the outside wheels. The inside rail is raised 5 cm (2")
  - The axles may have been aligned so as to point at the center of the circular track.
  - Nominal speed of the locos: 8 km/h (5 mph)

Question: would 4x 13.5 hp have sufficed to “get the train going” and accelerate it to the nominal speed? How long might that have taken?

Thanks in advanced!

-- Fred