>>Here is a shot for comparison. On the left is the Lionel SD40-2, in the middle is the Lionel GP-35, and on the right is the MTH fixed pilot (scale wheels version) of the SD45.<<
The only thing I see worth noting is the first two will navigate every type radius curved track while the third is hamstrung on O-72 or larger...
Exactly the point I tried to comunicate earlier in this thread.
Besides additional cost, there is a price to pay for some prototypical detail.
A wise decision by MTH to offer both swinging and fixed pilots of every diesel engine.
Cost aside, for me the new Chessie SD-40 would have been a nice addition, but access to all areas of my layout is priority one. It far outweighs any benifit from a self centering pilot and the limitations it brings with it.
Joe