For some reason Hornby has made a new chassis and keeper plate for this model to a much lower quality than when it was non railroad. The axle slots are now square and the rear non driven axle is rigidly mounted with no play. Mine could only just pull itself along. The old keeper plate had its pickups pointing upwards, but this one they point downwards and the rear ones foul the track. Snipping the ends off, slotting out the rear wheel slots and fitting a gentle rear spring transforms the model. Mine will now pull 10 coaches on the flat with ease. However I really don't like the square axle slots as these will soon wear and get sloppy, a problem I've had with an early produced 72xx. I suspect somebody said to Hornby you cant put a round pin in a square slot....