A couple of details on the new locomotive.
1. The motors with flywheels are mounted inside the trucks allowing ample space for 3rd party electronics inside the body.
2. The locomotive runs smoothly on O-27 curves and will not derail cars that normally don't derail on O-27 track. The coupler is mounted to the frame and pivots independently of the truck.
3. The sound for the locomotive has been recorded from an actual 44 ton locomotive with the original Caterpillar Prime movers. If you wish to adjust the volume see this post.
4. During testing the locomotive has demonstrated that it has enough power to pull 9 Williams box cars and two 60 ft Heavyweight cars on a straight and level track.
Regards,
3rail