More Marx 666. First photo shows the reverse unit lock out switch. One wire goes to the reverse unit coil. The other end goes to the pickup from the center rail shoe. The wire on the right is for the headlight.
Second photo is the Marx 666 at Bullwinkle (as in Moose) Tower on my layout. Tender has a Lionel coupler. The 480 coupler fits on the Marx truck.
Third photo is the 666 with a pair of rare boxcars I got for good prices. First car is a 6468x B & O tuscan automobile car. Second car is a NETCA K-Line New Haven "State of Maine" boxcar from 1990. Got this car for $ 10.00 because it had a broken truck.