Pythagoras is an Accucraft Exclesior class loco. Here are the technical specifications:
As you can see, Pythagoras has already had a few scrapes. On his very first run he left the rails and dropped 3 feet onto a concrete floor. This resulted in some damage to the cab, a dent in the saddle tank (visible in the picture above) and some scraped paint on the right-hand cylinder. Fortunately this well-built loco survived the experience and continues to steam well. Some of the smokebox paintwork has blistered off due to over-enthusiastic use of the gas regulator. Together these give a good impression of a loco that has seen heavy use.
More recently (early 2005) the bolts securing the rear pony truck have started to work loose. The thread that the rear bolt screws into has stripped; as a result the securing bolt tends to drop out which makes the loco very unstable. Fortunately a little PTFE (Teflon) tape wrapped around the offending bolt allowed it to screw in properly and as of March 5th. 2005, Pythagoras is again a useful working loco.
The following rear view shot of No. 4 shows the radio control fitting as well as some of the damage to the cab. The "official" method of adding r/c to these models is to control the reversing lever (aka the Johnson Bar). I decided to go a different way and the servo is linked direct to the steam regulator using a brass rod and an Accurcraft replacement regulator arm. You can clearly see the new arm in the middle of the cab back opening.
Here's a good side view of Pythagoras on the lift-out bridge:
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