Thanks for that Mike, I hadn't even looked into the history of the two engines that I bought (4837 and 4822), but good to hear that I don't have to modify at least one of them too extensively.
I've just received two Lenz Gold decoders today and fitted them, so they are ready to be put in operation now. The Lenz decoders unfortunately do not have enough flexibility in regards to lighting outputs, but have a good silent drive. I plan to upgrade these engines in the future with sound decoders however, and that will then also bring the lighting outputs up to speed.
Here's a few more pictures.
Geeps at Napa Jct. on HO layout by
K2K Koos, on Flickr
Geeps at Napa Jct. on HO layout by
K2K Koos, on Flickr
Koos