This is a modified version of the K 21 electric locomotive from 1934 F to L manual for O gauge track. I have made the wheelbase bigger and mounted the 6 volt E6 meccano motor in the middle instead of the front.The manual model is 5 holes wide, but I had difficulty in mounting the motor, so I was forced to keep the middle portion seven holes wide.The power is supplied from a 3 rail track, instead of overhead wires in the manual model I have also made a meccano roller collector using a collar and rubber bands for tension. I have made the front and rear bogeys using a combination of bush wheels and one inch pulleys instead of no. 20 flanged wheels.