Traditional Line: Basic model, no extra details, mostly unnumbered, all without sound, all powered units have 8 pin plugs for easy DCC installations
Executive Line: Ready to Run, super detailed, numbered, with DCC and Sound or DC with an 8 pin plug for easy DCC module installation.
Analog (DC) version features NMRA 8 & 21 pin plug for DCC, DCC/Sound version features LokSound Select Dual-Mode decoder which allows locomotive to be used on DC as well as on DCC layouts. Production of locomotives after 6-2014 have 21 pin sound and dcc socket. 8 pin sockets are no longer provided. Recommended DCC only decoder is LOK (21 pin) #91653 Sound Samples can be found at LokSoun