Lionel front prewar chugger unit complete for 250-255 Lionel engines. The chugger unit would make a chugging sound when the wheels moved and the side rod activation the switch. What you see you will get! That is a pretty good deal for the chugger unit. Many pictures for you to see. Look at pictures closely. That is the best. What you see you will get. See my other items mostyl prewar Lionel. Thank you for looking READ MY FEEDBACK. See pictures for this is the best description. Track Page Views With. Auctiva’s FREE Counter.