Just received my Acela set and add-on set and all ran well for 10 minutes! Then First Class coach coupling came apart and separated the coach’s from the engine. I have a 12’ x 12’ layout and the Acela when fully loaded is over 12’ so at high speed it doesn’t take long for the ends to meet very very fast. Fortunately I was paying attention and halted operations before crashing. The tiny screw and washer which holds the coupling linkage came loose and was gone. Good luck trying to find it.
I have been waiting over a week for a response from Lionel for a replacement part which by the way hasn’t any part number. Lionel has not yet added this set to the parts site. As a precaution I tightened the screw on the other coaches and the engines. I suggest using a drop of thread locker to prevent a reoccurrence. Meanwhile I have a very expensive paperweight sitting on my workbench.